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Open Source 164 startups

"Open Source" Startups

Every active startup we index tagged "Open Source", sorted by score and momentum.

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Last updated

2026-09-02

Hiring right now 11% 18 of 164

Open roles 461

Most-hired discipline Engineering

164 tech startups tagged "Open Source" are currently indexed on techstartupslist.com. This page lists every active match, with logos, taglines, and direct links to each company's site — no paywalled middleman. Notable "Open Source" startups in the index include Supabase, PostHog, Cal.com, Dub, and Docker. Each profile surfaces team size, founding year, category, and any open roles their careers page is publicly scrapable for. These companies concentrate in AI / ML, Infrastructure, and Dev Tools — the categories where this tag shows up most often in our scrape. Geographically, "Open Source" lean toward San Francisco, New York City, and London, with the rest spread across remote-first teams and other hubs. Y Combinator batches represented here: W23, W21, W22, and S22, among others. 12% of these companies are hiring right now (20 of 164) — a live signal from the jobs we scrape, not a static directory claim; 5 are currently flagged as trending on hiring momentum; the listing refreshes whenever the scrape runs so tag membership stays current as companies re-tag and new ones appear.

Build in a weekend. Scale to millions.

Developer ToolsOpen SourceBig Data

The single platform to analyze, test, observe, and deploy new features

Developer ToolsB2BOpen Source

Scheduling infrastructure for everyone.

Open SourceSchedulingSaaS

Open-source link attribution platform.

Open SourceAnalyticsMarketing

Software development platform.

Open SourceDevOpsEnterprise Software

A complete DevOps platform delivered as a single application.

Developer ToolsDevSecOpsOpen Source

Open-source, serverless vectordb for production-scale generative AI

AIOpsMachine LearningOpen Source

A single API for all your integrations

Developer ToolsSaaSOpen Source

Database for AI

Computational StorageDeep LearningGenerative AI

Open-source, AI-first and no-code business automation tool

Workflow AutomationOpen SourceNo-code

Context layer for production-grade AI agents

Artificial IntelligenceDeveloper ToolsOpen Source

Frontend Platform for eCommerce

Developer ToolsOpen SourceE-commerce

Building the definitive all-in-one on-device AI productivity tool

Artificial IntelligenceOpen SourceAI Assistant

Apollo helps engineering teams accelerate delivery

Developer ToolsOpen SourceGraphQL

Cloud-native stream processing

Developer ToolsSaaSOpen Source

The complete production quality platform. AI-powered E2E testing,…

Developer ToolsSaaSOpen Source

Authorization Infrastructure securing AI at OpenAI, Zoom, & more

Artificial IntelligenceDeveloper ToolsSecurity

AI-Native Cloud Platform

Artificial IntelligenceDeveloper ToolsOpen Source

The authentication framework for TypeScript

Developer ToolsSecurityOpen Source

Observability and Governance for AI-Generated Python scripts.

Developer ToolsOpen SourceInfrastructure

Leading open-source web agent project with 50k stars in 3 months

Artificial IntelligenceOpen SourceAPI

Bun is an incredibly fast all-in-one JavaScript toolkit

Developer ToolsOpen Source

Low-latency AI engine for mobile devices & wearables

Artificial IntelligenceDeveloper ToolsHard Tech

DataOps Observability Platform for Snowflake

Cloud Workload ProtectionMachine LearningAnalytics

The AI notepad that knows and works for you

SaaSProductivityOpen Source

The modern, open source, self-hosted AI customer support platform

B2BCustomer SuccessOpen Source

Real-time. Big data. PostgreSQL

Open SourceBig DataDatabases

The Authorization Layer for AI Agents

Artificial IntelligenceSecurityOpen Source

CodeStream is a Developer Collaboration Platform designed to…

Developer ToolsSaaSCollaboration

The SAFE for commercial contracts

SaaSOpen SourceSales

The LLM Eval and Observability Platform for AI Quality

Developer ToolsGenerative AIOpen Source

Webhooks Gateway for outgoing and incoming webhooks.

Developer ToolsB2BOpen Source

Open source tools of modern distributed systems.

Open SourceDevOps

Connect your users to their apps

Developer ToolsB2BWorkflow Automation

Give every agent a cloud desktop

Open source tools & services for reliable AI Agents & AI Applications

AIOpsArtificial IntelligenceDeveloper Tools

Conversational Voice and Multimodal AI built with Open Source

Developer ToolsOpen SourceAI

Spark-on-Kubernetes Data Engineering Platform

SaaSB2BOpen Source

Workspace for your AI Agents, Build any Workflow.

Workflow AutomationOpen SourceCRM

Open-source customer engagement & messaging automation

B2BMessagingOpen Source

Open-source data observability for data teams

Developer ToolsAnalyticsOpen Source

Modern user-focused observability built on OpenTelemetry

Artificial IntelligenceSaaSOpen Source

Self-Service Data Prep and Blend Built for Data Teams.

SaaSOpen Source

ChatGPT's memory feature in an open, portable format

SaaSProductivityOpen Source

Open-source monitoring for machine learning models

Developer ToolsMachine LearningB2B

Expected Parrot

Simulate your customers with AI agents

Generative AISaaSOpen Source

Instantly offer SDKs and API Docs

Developer ToolsSaaSB2B

Fig adds visual apps, shortcuts, and autocomplete to your terminal.

Developer ToolsDevSecOpsOpen Source

Showing 48 of 164 Filter the directory by this tag →

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1 of 4 similar companies is hiring right now · most common: Engineering

Secure Enterprise Collaboration.

CollaborationSecurityEnterprise

Email for developers

EmailDeveloper InfrastructureSaaS

The easiest way to set up a modern data stack

SaaSB2BData Engineering

Data Versioning, Data Pipelines, and Data Lineage

Developer ToolsMachine LearningData Science

YC W23 startupsAll cohort members Startups in San Francisco2567 indexed AI / ML startupsFull category listing

"Open Source" startups in San Francisco90 startups "Open Source" startups in New York City14 startups "Open Source" startups in London9 startups "Open Source" startups in Los Angeles6 startups "Open Source" startups in Paris5 startups

Frequently asked questions

How many "Open Source" startups are indexed?

Our index currently tracks 164 active tech startups tagged "Open Source". New entries appear automatically as scrapers discover them; shutdowns are flagged inactive and drop off this listing.

What are the top "Open Source" startups?

Among the "Open Source" startups indexed here: Supabase, PostHog, and Cal.com, plus 161 more on this page. Sorting prioritizes curated score, sponsored placements, and trending signals.

Are "Open Source" startups hiring right now?

20 of the 164 companies on this page currently have open roles in our jobs index. Open roles link straight to each company's own careers page.

How often is the "Open Source" startup list updated?

Automated scrapers refresh this page on the same daily cadence as the rest of the directory. The last index update was 2026-09-02.