What they do:
Self-optimizing neocloud that cuts LLM costs by 100x
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HQ: San Francisco, CA, United States
Top Open Source Startups
This list has 177 startups and was last updated on Oct 15, 2026. 42 of them are hiring right now. Biggest hubs: San Francisco (96), New York (15), and London (10). Largest teams: GitLab, InfluxData, and Docker. Latest round: Supabase raised $150M (Oct 2, 2026).
177 startupsPage 4 of 5
What they do:
The infrastructure to run coding agents for your team
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HQ: San Francisco, CA, United States
What they do:
Self-improving inference workstation
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HQ: Milan, Italy
What they do:
Open source alternative to Semrush and Ahrefs
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HQ: Boston, MA, United States
What they do:
Agent swarms that make long-running tasks exponentially faster
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HQ: London, United Kingdom
What they do:
The simplest way to extract web data at scale
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HQ: San Francisco, CA, United States
What they do:
Verify AI-generated code before you ship it
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HQ: San Francisco, CA, United States
What they do:
ChatGPT's memory feature in an open, portable format
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HQ: San Francisco, CA, United States
What they do:
The browser for agentic development
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HQ: San Francisco, CA, United States
What they do:
On-device Knowledge Graph engine for Enterprise Software
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HQ: San Francisco, CA, United States
What they do:
Combining open-source AI models for better answers at lower cost
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HQ: San Francisco, CA, United States
What they do:
Caveman cuts what AI agents cost without making them dumber.
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HQ: Amsterdam, Netherlands
What they do:
Get up and running with large language models.
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HQ: San Francisco, CA, United States
YC W21Growth stage
What they do:
Remote Shell Access in the Browser
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HQ: San Francisco, CA, United States
YC W23Early stage
What they do:
Open-source agentic security automation platform
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HQ: New York, NY, United States
YC W24Early stage
What they do:
Random labs is building long running autonomous coding agents.
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HQ: San Francisco, CA, United States
YC S24Early stage
What they do:
AI teammates for your business-critical work.
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HQ: San Francisco, CA, United States
YC S26Early stage
CoreOS
Acquired
What they do:
Open source tools of modern distributed systems.
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HQ: San Francisco, CA, United States
Embrace
Acquired
What they do:
Modern user-focused observability built on OpenTelemetry
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HQ: Los Angeles, CA, United States
Citus Data
Acquired
What they do:
Real-time. Big data. PostgreSQL
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HQ: San Francisco, CA, United States
Replicate
Acquired
What they do:
Run machine learning models in the cloud
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HQ: San Francisco, CA, United States
Fern
Acquired
What they do:
Instantly offer SDKs and API Docs
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HQ: New York, NY, United States
Langfuse
Acquired
What they do:
Open source LLM engineering platform
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Data Mechanics
Acquired
What they do:
Spark-on-Kubernetes Data Engineering Platform
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Onyx
Acquired
What they do:
Open Source AI Chat
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HQ: San Francisco, CA, United States
Requestly
Acquired
What they do:
Open-Source Postman alternative
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HQ: San Francisco, CA, United States
Bun
Acquired
What they do:
Bun is an incredibly fast all-in-one JavaScript toolkit
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HQ: San Francisco, CA, United States
RethinkDB
Acquired
What they do:
The open source database for the realtime web.
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HQ: San Francisco, CA, United States
CodeStream
Acquired
What they do:
CodeStream is a Developer Collaboration Platform designed to…
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HQ: New York, NY, United States
Chaos Genius
Acquired
What they do:
DataOps Observability Platform for Snowflake
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Traceloop
Acquired
What they do:
Know what your LLM is doing — and why it’s failing
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highlight.io
Acquired
What they do:
The open source, fullstack monitoring platform: stop guessing why…
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HQ: Seattle, WA, United States
Trieve
Acquired
What they do:
All-in-one API for search, RAG, & recommendations
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HQ: San Francisco, CA, United States
Hydra
Acquired
What they do:
Serverless Analytics on Postgres
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HQ: San Francisco, CA, United States
Optic
Acquired
What they do:
Making APIs Developer-friendly
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HQ: New York, NY, United States
Fig
Acquired
What they do:
Fig adds visual apps, shortcuts, and autocomplete to your terminal.
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HQ: San Francisco, CA, United States