Awesome open-source alternatives to SaaS

Awesome list of open-source startup alternatives to established SaaS products. Maintained by folks at

Also checkout our ROSS index: fastest-growing open-source startups, every quarter.

Criteria

• Its product is strongly based on an open-source repo
• It has a well-known closed-source competitor, solving a similar business problem
• It is a private for-profit company, founded in the last 10 years
• Its repo has 100+ stars on GitHub

Don't hesitate to contribute and add new startups. Let's build the most comprehensive list together.

Any questions or suggestions? Feel free to DM project maintainer @garrrikkotua

Startup List

All startups in the list are sorted by categories and sorted in alphabetical order. If you click on the stars badge you will get to the product's repo. Have a good search!

|Category|Company|Description|GitHub Stars|Alternative to| |:-------|:------|:----------|:----------:|:------------:| API Gateway|Apache APISIX|Cloud Native API Gateway under the Apache Software Foundation||apigee API Platform|Firecamp|DX first open-source API devtool||Postman API Platform|Fusio|API management platform||Postman API Platform|Hoppscotch|API development ecosystem||Postman API Platform|Keploy|e2e Testing and Data Mocking||Smartbear, Newman API Platform|Step CI|API Testing and Monitoring||Checkly, Postman Auth & SSO|BoxyHQ|Enterprise Readiness made simple||Auth0| Auth & SSO|Cerbos|Granular access control||Okta, Auth0 Auth & SSO|FusionAuth|User authentication and session management framework||Okta, Auth0| Auth & SSO|Hanko|Passkey-first authentication framework||Okta, Auth0 Auth & SSO|Keycloak|User authentication and session management framework||Okta, Auth0 Auth & SSO|OPAL (Permit.io)|Authorization administration framework (Open Policy)||Okta, Auth0 Auth & SSO|Ory|Identity platform||Okta, Auth0 Auth & SSO|Oso|Authorization building framework||Okta, Auth0 Auth & SSO|Supertokens|User authentication and session management framework||Okta, Auth0 Auth & SSO|Warrant|Authorization and access control as a service||Okta, Auth0 Auth & SSO|Zitadel|User authentication and session management framework||Okta, Auth0| Backend as a service|AceBase|Backend server with REST APIs to manage core backend needs||Firebase Backend as a service|Amplication|Backend server with REST and GraphQL APIs to manage core backend needs||Firebase Backend as a service|Appwrite|Backend server with REST APIs to manage core backend needs||Firebase Backend as a service|CASE|Lightweight Backend-as-a-Service with essential features||Firebase| Backend as a service|Encore|Backend Development Engine for cloud-based apps, APIs, and distributed systems||Firebase| Backend as a service|Kuzzle|Backend server with REST APIs to manage core backend needs||Firebase Backend as a service|Nhost|Backend server with GraphQL||Firebase Backend as a service|PocketBase|Backend server with REST APIs to manage core backend needs||Firebase| Backend as a service|Supabase|Backend server with REST APIs to manage core backend needs||Firebase Business Intelligence|Metabase|Business intelligence software||Tableau, Power BI, DataStudio Business Intelligence|Preset|Modern BI platform powered by Apache Superset||PowerBI, Tableau, Mode Analytics| CMS|Builder|Drag and drop page builder and CMS||Contentful CMS|Concrete|CMS for teams||Contentful| CMS|Decap CMS|Git-based CMS for static site generators||Contentful CMS|Directus|Data platform which wraps any database with an intuitive app||Contentful CMS|Ghost|Headless Node.js publishing platform||Medium, Substack CMS|Plasmic|The headless page builder for singe-page frameworks||Contentful| CMS|Strapi|Node.js Headless CMS to build customisable APIs||Contentful CMS|Sulu|Modern Symfony based CMS||Contentful CMS|Tina|Visual editor for React websites||Contentful CMS|Webiny|Enterprise serverless CMS||Contentful Cloud Data Warehouse|Databend|Elastic and Workload-Aware Modern Cloud Data Warehouse||Snowflake| Cloud Development Environment|Gitpod|Automated provisioning of cloud development environments with multiple git providers & IDEs||Codespaces| Cloud Storage|Minio|S3 compatible object storage||Amazon S3| Cloud Storage|Storj|Decentralized cloud storage||Amazon S3| Cloud-Native Application Protection Platform|Deepfence ThreatMapper|Apache v2, powerful runtime vulnerability and compliance scanner for kubernetes, virtual machines, cloud and serverless.||Palo Alto Prisma| Communication|Fonoster|APIs for SMS, voice and video||Twilio| Communication|Novu|Components and APIs for email, sms, direct and push||Courier, MagicBell, Knock| Community Platform|crowd.dev|Suite of community and data tools built to unlock community-led growth for your organization||Orbit, Common Room, Commsor| Customer Data Platform|Jitsu|Fully-scriptable data ingestion engine for modern data teams||Segment Customer Data Platform|Rudderstack|Customer data platform for developers||Segment Customer Data Platform|Tracardi|Customer Data Platform with Consumer Journey automation engine||Segment, Zapier Customer Engagement|Chaskiq|Live chat widget||Intercom, Zendesk Customer Engagement|Chatwoot|Live chat widget||Intercom, Zendesk Customer Engagement|Papercups|Live chat widget||Intercom, Zendesk Cybersecurity|CloudQuery|Assess, audit, and evaluate the configurations of your cloud assets.||AWS Config, GCP Cloud Asset Inventory, AWS GuardDuty| Cybersecurity|CrowdSec|Collaborative IPS able to analyze visitor behavior and to provide an adapted response to all kinds of attacks.||GreyNoise| Cybersecurity|Faraday|Open Source Vulnerability Management and Orchestration Platform||Plextrac, Vulcan| Cybersecurity|Firezone|VPN Server & Firewall for teams||OpenVPN Access Server Cybersecurity|Gravitl|WireGuard virtual networking platform (VPN)||Tailscale, OpenVPN| Cybersecurity|LunaTrace|Dependency Vulnerability Scanner and SBOM Inventory||GitHub Dependabot, Snyk.io, SonaType Nexus| Cybersecurity|Matano|Open source cloud-native security lake platform (SIEM alternative) for threat hunting, detection & response, and cybersecurity analytics at petabyte scale on AWS||Splunk, Elastic Cloud| Cybersecurity|NetBird|Zero Configuration Mesh VPN for Business||Tailscale, OpenVPN| Cybersecurity|Nuclei|Vulnerability scanner based on simple YAML based DSL||Tenable Nessus| Design|21st.dev|The NPM for Design Engineers||Landingfolio| Design|Modulz|Code-based tool for designing and prototyping||Figma| Design|Penpot|Design & prototyping platform||Figma| Digital Signature|DocuSeal|Digital Signing Infrastructure||DocuSign| Digital Signature|Documenso|Digital Signing Infrastructure||DocuSign| Digital Signature|LibreSign|Digital document signer||DocuSign E-commerce|Bagisto|Headless e-commerce platform||Shopify, Ecwid E-commerce|Medusa|Headless e-commerce platform||Shopify, Ecwid E-commerce|Saleor|Headless e-commerce platform||Shopify, Ecwid E-commerce|Shuup|Headless e-commerce platform||Shopify, Ecwid E-commerce|Sylius|Headless e-commerce platform||Shopify, Ecwid E-commerce|Vendure|Headless e-commerce platform||Shopify, Ecwid E-commerce|Vue Storefront|Frontend for e-commerce platform||Shogun ELT / ETL|Airbyte|Data integration platform||Fivetran ELT / ETL|Benthos|Data streaming processor with yaml-driven pipeline configuration||Fivetran ELT / ETL|Dagster|Orchestration platform for data assets||Fivetran ELT / ETL|Kestra|orchestration and scheduling platform||Fivetran ELT / ETL|Orchest|No-code data pipelines builder||Fivetran ELT / ETL|Prefect|Data orchestration platform for a modern data stack||Fivetran ELT / ETL|Selefra|An open-source policy-as-code software that provides analytics for multi-cloud and SaaS.||Fivetran ERP|DoliCloud | Business management suite (ERP and CRM)||Oracle Fusion ERP Cloud,Odoo,Microsoft Dynamics ERP|ERPNext | Agile, modern, module based Business management suite||SAP Business One, Odoo Email marketing|Keila|Email newsletter tool||Mailchimp, Sendinblue| Enterprise Search|AppBase|Search UI components for React and Vue||Algolia Enterprise Search|Jina.ai|Neural search framework for 𝙖𝙣𝙮 kind of data (including images)||Algolia Enterprise Search|Manticore Search|Easy to use open source fast database for search||Elastic Cloud Enterprise Search|Meilisearch|Typo tolerant search engine||Algolia Enterprise Search|Qdrant|Vector similarity search engine with extended filtering support||Google Vertex AI, Algolia| Enterprise Search|SeMI's Weaviate|Real-time vector search engine||Google Vertex AI, Algolia Enterprise Search|TypeSense|Typo tolerant fuzzy search engine||Algolia Enterprise Search|Zilliz's Milvus|Vector database for AI applications||Google Vertex AI Enterprise Search|Zinc Labs's Zinc|Cloud native full text search||Elastic Cloud Enterprise Search|deepset|NLP platform to build enterprise-grade semantic search||AWS Kendra, QnA Maker| Feature flag and toggle management|FlagSmith|Feature Flag & Remote Config Service||LaunchDarkly Feature flag and toggle management|GrowthBook|Feature flags and A/B testing||LaunchDarkly Feature flag and toggle management|Unleash|Feature flags platform||LaunchDarkly File Hosting|Filestash|A file manager that let you manage your data anywhere it is located||Dropbox, Google Drive| File Hosting|Nextcloud|A personal cloud which runs on your own server||Dropbox, Google Drive| File Hosting|Owncloud|A personal cloud which runs on your own server||Dropbox, Google Drive File Hosting|Spacedrive|Cross-platform file manager, powered by a virtual distributed filesystem (VDFS) written in Rust||Dropbox, Google Drive| Financial Service|Lago|Open Source Billing API||Stripe Billing, Chargebee| Financial Service|OpenBB Terminal|Investment research for everyone||Bloomberg Form Building|FormKit| A software to help build attractive forms||Vueform,Typeform Form Building|Formbricks| Build forms and receive & manage submission data in one platform ||Typeform, Google Forms, React Hook Form Form Building|Formio| A Form and Data Management Platform for Progressive Web Applications||Vueform,Typeform Forum Software|Discourse|A platform for community discussion||Tribe, Circle Forum Software|Vanilla|A platform for community discussion||Tribe, Circle| Graph database|ArangoDB|Graph database and document store||TigerGraph, Amazon Neptune Graph database|Memgraph|In-memory graph database||TigerGraph, Amazon Neptune Graph database|Neo4j|Graph database platform||TigerGraph, Amazon Neptune Graph database|TerminusDB|Knowledge graph and document store||TigerGraph, Amazon Neptune Helpdesk Solution|Peppermint|Ticket Management & Helpdesk system||Zendesk Helpdesk Solution|UVDesk|Ticket Management & Helpdesk system||Zendesk Internal Tools|AppSmith|Low-code platform for internal tools||Retool Internal Tools|Budibase|Low-code platform for internal tools||Retool Internal Tools|ILLA Cloud|Low-code platform for developers to build internal tools in minutes.||Retool Internal Tools|Lowdefy|YAML-based low-code platform for internal tools||Retool Internal Tools|Tooljet|Low-code framework for internal tools||Retool Internal Tools|Windmill|Company-wide apps and automations from minimal python or typescript scripts||Retool| Localization (i18n)|Tolgee|Developer & translator friendly web-based localization platform||Lokalise, Transifex, Crowdin, POEditor Localization (i18n)|inlang|Developer-first localization infrastructure built on git||Lokalise, Transifex, Crowdin, POEditor Log Management|Graylog|Log management platform||Splunk Log Management|Quickwit|Cloud-native log management & analytics||Elastic Cloud ML Ops|Cortex|Production infrastructure for machine learning||AWS SageMaker ML Ops|Metarank|AutoML style personalized ranking||AWS Personalize, Tecton| ML Ops|MindsDB|In-database machine learning platform||BigQuery ML| ML Ops|Ploomber|YAML-based pipeline builder for ML models||AWS SageMaker| ML Ops|Seldon|Deployment & monitoring for machine learning at scale||AWS SageMaker, Google Vertex AI| ML Ops|Zilliz's Towhee|Platform for generating embedding vectors||AWS SageMaker| Marketing SaaS|Dub|Open-source Bitly Alternative with built-in analytics||Bitly Messaging|Element|Enterprise communication platform||Slack| Messaging|Mattermost|Enterprise communication platform for developers||Slack| Messaging|Rocket.chat|Enterprise communication platform||Slack| Messaging|Tinode|General instant messaging||WhatsApp, Telegram| Messaging|Zulip|Team chat||Slack| Metrics store|Cube.js|Headless business intelligence suite||Looker Metrics store|Evidence|Lightweight BI using SQL and markdown||Looker Metrics store|LightDash|Low-code metrics layer, alternative to Looker||Looker Metrics store|MLCraft|Low-code metrics layer, alternative to Looker||Looker Metrics store|MetriQL|Headless business intelligence suite||Looker No-code database|Baserow|No-code database and Airtable alternative||AirTable No-code database|NocoDB|No-code database and Airtable alternative||AirTable No-code database|Rowy|Extendable Airtable-like spreadsheet UI for databases||AirTable| No-code database|Totum|Business database for non-programmers||AirTable| Notetaking|AppFlowy|Open-source alternative to Notion||Notion Notetaking|Athens Research|Knowledge graph for research and notetaking||Roam Research| Notetaking|Bangle.io|A rich note note taking web app that works on top of your locally saved Markdown files||Notion| Notetaking|Boost Note|Collaborative workspace for developer teams||Notion| Notetaking|Dendron|Knowledge base plugin for VS Code||Roam Research| Notetaking|Joplin|Secure, Cross-platform, Open-Source Markdown Note Taking App||Evernote, Onenote, Roam Research| Notetaking|Logseq|Knowledge base manager||Roam Research| Notetaking|Notabase|Powerful and easy-to-use note-taking app for networked thinking||Notion, Roam Research| Notetaking|Notesnook|A fully open source & end-to-end encrypted note taking alternative to Evernote.||Evernote, OneNote| Notetaking|Outline|Wiki and knowledge base||Notion| Notetaking|Trilium.cc|Personal knowledge base||Evernote, Onenote Observability and monitoring|Chaos Genius|ML powered analytics engine for outlier/anomaly detection and root cause analysis|genius>|AWS Lookout, Anodot, Sisu Data, Outlier Observability and monitoring|Grafana|Observability and data visualization platform||DataDog, NewRelic Observability and monitoring|Netdata|Application monitoring and observability platform||DataDog, NewRelic Observability and monitoring|OpenStatus|Synthetic monitoring platform||DataDog, NewRelic Observability and monitoring|Sentry|Application monitoring with a focus on error reporting||DataDog, NewRelic Observability and monitoring|Signoz|Application monitoring and observability platform||DataDog, NewRelic Observability and monitoring|Uptrace|Application monitoring and observability platform||DataDog, NewRelic Observability and monitoring|VictoriaMetrics|Application monitoring and observability platform||DataDog, NewRelic Password manager|BitWarden|Password manager for teams and individuals||1Password Password manager|Padloc|Password manager for teams and individuals||1Password| Password manager|Passbolt|Password manager for teams and individuals|api>|1Password Platform as a service|Coolify|Self-hostable Heroku alternative||Heroku| Platform as a service|Dokku|An open source PAAS alternative to Heroku||Heroku| Platform as a service|Otomi|Self-hosted PaaS for Kubernetes||Heroku Platform as a service|Porter|Kubernetes powered PaaS that runs in your own cloud||Heroku Platform as a service|Pulumi|Universal Infrastructure as Code||Heroku| Platform as a service|Qovery|Kubernetes powered PaaS that runs in your own cloud||Heroku Platform as a service|Space Cloud|Serverless cloud deployment platform||Heroku| Platform as a service|dyrector.io|Simplify container delivery without vendor lock||Heroku| Product Analytics|Objectiv|Product analytics infrastructure||Google Analytics, Amplitude, Mixpanel| Product Analytics|PostHog|Product analytics platform||Amplitude, MixPanel Product Analytics|Trench|Open source analytics infrastructure||Segment, Google Analytics, Amplitude| Project Management|Focalboard|Alternative to Trello, Notion, and Asana||Trello, Notion, Asana| Project Management|OpenProject|Project management software||Asana, Trello| Project Management|Plane|Alternative to Linear, JIRA, Trello and Height||Linear, JIRA, Trello, Height| Project Management|Taiga|Project management software||Asana, Trello, Jira| Project Management|Vikunja|The to-do app to organize your next project.||Todoist, Trello, Asana| Relational database|PingCAP|NewSQL database that supports HTAP workloads||Amazon Aurora, Google Cloud Spanner| Relational database|Yugabyte|High-performance distributed SQL database||Amazon Aurora, Google Cloud Spanner| Remote Desktop Application|RustDesk|Open source virtual / remote desktop infrastructure for everyone||TeamViewer| Reverse ETL|Castled|Data synchronization framework focused on external apps||Hightouch, NewRelic Reverse ETL|Grouparoo|Data synchronization framework||Hightouch Robotic Process Automation (RPA)|RoboCorp|Set of tooling that allows to create automation packages||UiPath Scheduling|Cal.com|Scheduling infrastructure, alternative to Calendly||Calendly Session replay software|OpenReplay|Session replay stack for developers||LogRocket, FullStory Social Media|Postiz|Self-hosted social media scheduling tool|