Category — Open Source

96 Open Source startups worth watching

A curated index of open source companies — from bootstrapped indie hackers to venture-backed category-defining startups. Updated weekly.

Open Source Startups
The home of open-source-first commercial startups.
Cal.com
Open-source scheduling infrastructure.
PostHog
The single platform to analyze, test, observe, and deploy new features
Plausible Analytics
Privacy-first Google Analytics alternative.
n8n
Workflow automation for technical people.
Appwrite
Open-source backend as a service.
Strapi
The leading open-source headless CMS.
Astral
Python tooling, redesigned for speed.
Pydantic
The Python data validation library, used by everyone.
Documenso
The open-source DocuSign alternative.
Weaviate
Open-source vector database.
Zed
The editor for what's next.
Infisical
Unified platform for secrets, certs, and privileged access management
Trigger.dev
Build and deploy fully‑managed AI agents and workflows
Polar
Open-source funding & monetization.
Ghost
Independent technology for modern publishing.
Metabase
The easiest way to let your team explore your data.
Cube
The semantic layer for the AI-era of data.
SigNoz
Open source alternative to DataDog
Langfuse
Open source LLM engineering platform
Yugabyte
The distributed SQL database for cloud-native apps.
Airbyte
Context layer for production-grade AI agents
tldraw
Build whiteboards into your product.
Unkey
Open-source API authentication and authorization.
Medusa
Open-source headless commerce platform.
TinaCMS
The open-source headless CMS for the Jamstack.
Baserow
Open-source no-code database.
NocoDB
The open-source Airtable alternative.
Directus
The instant headless CMS + data platform.
Appsmith
Open-source platform to build admin panels, dashboards.
SurrealDB
The ultimate multi-model database
EdgeDB
A next-generation relational database
LanceDB
Open-source, serverless vectordb for production-scale generative AI
MinIO
High-performance S3-compatible object storage
RisingWave
Streaming SQL for real-time analytics
Ory
Cloud native identity and access management
SuperTokens
Open source alternative to Auth0 / AWS Cognito / Firebase Auth
Keystatic
Git-based CMS for your code editor and GitHub
Umami
Simple, fast, privacy-focused web analytics
OpenReplay
Open-source, self-hosted, session replay tool for developers.
HyperDX
Open-source, dev-friendly observability.
OpenPanel
Open source analytics for product and marketing teams
Listmonk
Self-hosted newsletter and mailing list manager
Mattermost
Secure Collaboration for Technical Teams
Zulip
Organized team chat that does not interrupt you
Coolify
Self-host Heroku and Netlify on your own server
Portainer
Container management made simple
Traefik
The cloud-native application proxy
Gitea
Painless self-hosted all-in-one software development
Garden
Dev environments and CI/CD for Kubernetes teams
DevPod
Open source dev containers on any infrastructure
GrowthBook
Open source feature flagging and A/B testing
Flagsmith
Feature flags and remote config for any platform
Unleash
The enterprise open source feature management solution
Saleor
Open source GraphQL-first e-commerce platform
Vendure
A headless GraphQL e-commerce framework
Nuclei
Fast and customizable vulnerability scanner
Trivy
All-in-one open source security scanner
Caido
A lightweight web security auditing toolkit
Bytebase
Database DevOps and CI/CD for teams
Open WebUI
ChatGPT-style UI for any LLM
LobeChat
Modern open source ChatGPT UI framework
LiteLLM
Call every LLM API like it's OpenAI [100+ LLMs]
OpenLIT
Open source LLM observability and evaluation
Opik
Open source LLM evaluation and tracing
DeepEval
The open source LLM evaluation framework
Flowise
Open source GenAI development platform
Langflow
Visual framework for building multi-agent AI apps
Bruno
Open source IDE for exploring APIs
Hasura
Instant GraphQL and REST APIs on your data
Excalidraw
Virtual whiteboard for sketching hand-drawn diagrams
AppFlowy
Open source Notion alternative
Outline
Fast, collaborative, wiki-style knowledge base
Logseq
Networked notes and knowledge graph
Notesnook
End-to-end encrypted notes app
Memos
Lightweight, self-hosted memo hub
GlitchTip
Open source error tracking
OpenObserve
Open source observability with 140x lower storage costs
Actual Budget
Local-first personal budgeting app
OpenBB
Open source investment research terminal
Immich
Self-hosted Google Photos replacement
PhotoPrism
AI-powered photo manager with private cloud
Mathesar
Database UI as intuitive as a spreadsheet
OpenMetadata
Open standard for metadata and data discovery
Steampipe
SQL for cloud APIs and infrastructure
Monica
Personal CRM to remember your relationships
Rallly
Open source scheduling and meeting polls
Huly
All-in-one project management platform
Grist
Modern relational spreadsheet with database power
Firezone
Easiest way to set up Zero Trust Access for your team
SuperAgent
Security for AI-native developers
Postal
Full-featured open source mail delivery server
Stalwart
Secure and modern open source mail server
Mautic
Open source marketing automation platform
Docmost
Open source Confluence and Notion alternative
Grafana
The open observability platform