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Seed Open Source Companies

Explore 127 open source startups that raised seed funding. Access verified founder contact information and fundraising data.

Total Companies
127
Total Funding
$96.8M
Avg Funding
$3.9M
Cities
18

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San Francisco, United States
$2.2M
raised

UpTrain develops an open-source toolkit to observe and refine AI applications.

Apr 2023
Pre-Seed

Founder Contacts

30,000+ verified contacts

Portland, United States
$500K
raised

moonrepo is an open-source build tool for monorepos and large codebases.

Apr 2023
Pre-Seed

Founder Contacts

30,000+ verified contacts

San Francisco, United States
$500K
raised

DAGWorks develops an open-core platform for data science teams to develop, produce, and maintain machine learning.

Apr 2023
Pre-Seed

Founder Contacts

30,000+ verified contacts

London, United Kingdom
$8.5M
raised

Calimero Network is a blockchain infrastructure that helps clients in controlling data.

Jan 2023
Seed

Founder Contacts

30,000+ verified contacts

Dublin, Ireland

Contember is a software company that specializes in AI and typescript for data fetching instantly.

Jan 2024
Pre-Seed

Founder Contacts

30,000+ verified contacts

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30,000+ verified emails
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Antwerp, Belgium
$1.2M
raised

The world's first Logistics Enablement platform empowering freight forwarding teams.

Dec 2025
Seed

Founder Contacts

30,000+ verified contacts

Lenexa, United States
$1.5M
raised

OpenRelay is a distributed relayer of fine order book infrastructures.

Dec 2021
Seed

Founder Contacts

30,000+ verified contacts

San Francisco, United States
$500K
raised

PearAI is an open-source, AI-powered code editor that integrates AI tools to streamline development.

Dec 2024
Pre-Seed

Founder Contacts

30,000+ verified contacts

San Francisco, United States
$500K
raised

Velum Labs provides a firewall that redacts sensitive information in data and documents.

Dec 2025
Pre-Seed

Founder Contacts

30,000+ verified contacts

San Francisco, United States
$500K
raised

OpenBuilder is the vibe coding platform that helps non-technical builders take their ideas to production.

Dec 2025
Pre-Seed

Founder Contacts

30,000+ verified contacts

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30,000+ verified emails
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Tallinn, Estonia
$5.7M
raised

Decentralized Prime Brokerage that connects lenders, traders and market makers.

Dec 2021
Seed

Founder Contacts

30,000+ verified contacts

San Francisco, United States

Metriport is an open-source platform that makes it easy for healthcare organizations to access and exchange medical data for their patients.

Dec 2022
Seed

Founder Contacts

30,000+ verified contacts

Union City, United States
$3.0M
raised

Hoppscotch is an open-source API development system that offers to create, test, save, and share API requests services.

Dec 2021
Seed

Founder Contacts

30,000+ verified contacts

San Francisco, United States
$8.0M
raised

Kilo Code provides an open-source AI-powered coding assistant that supports code generation, debugging, and documentation.

Dec 2025
Seed

Founder Contacts

30,000+ verified contacts

Reggio Nell'emilia, Italy
$1.2M
raised

Pioneering Data Management for Physical AI and Robotics.

Jan 2026
Pre-Seed

Founder Contacts

30,000+ verified contacts

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30,000+ verified emails
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Groningen, The Netherlands
$4.6M
raised

Odyssey is the maker of metaverse stack for collaboration based in The Netherlands.

Nov 2021
Seed

Founder Contacts

30,000+ verified contacts

Los Altos, United States
$5.2M
raised

A No-code LLM platform to eliminate manual processes and automate workflows involving unstructured data.

Nov 2022
Seed

Founder Contacts

30,000+ verified contacts

Carver, United States
$250K
raised

Open Source Software Development

Jan 2024
Pre-Seed

Founder Contacts

30,000+ verified contacts

Wilmington, United States

Catalyst is an open-source liquidity protocol for modular blockchains, developed by Cata Labs.

Jan 2024
Seed

Founder Contacts

30,000+ verified contacts

Seattle, United States
$8.1M
raised

Hedgehog delivers open networking software allows organizations design, deploy, and operate modern AI data centers

Nov 2025
Seed

Founder Contacts

30,000+ verified contacts

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30,000+ verified emails
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San Francisco, United States
$5.3M
raised

Langtrace AI is an open source LLM application observability and evaluations platform

Oct 2022
Seed

Founder Contacts

30,000+ verified contacts

Suwalki, Poland
$500K
raised

Reactive Data Processing Company

Oct 2021
Pre-Seed

Founder Contacts

30,000+ verified contacts

Berlin, Germany
$17.0M
raised

Immerok is building a fully managed Apache Flink cloud service for real-time stream processing applications at scale.

Oct 2022
Seed

Founder Contacts

30,000+ verified contacts

Zug, Switzerland
$10.0M
raised

CUE Labs is a new platform focused on turning configuration management from a source of chaos into a source of reliability.

Oct 2025
Seed

Founder Contacts

30,000+ verified contacts

Keila, Estonia
$12.0M
raised

AutoGPT is a developer of open-source experimental applications.

Oct 2023
Seed

Founder Contacts

30,000+ verified contacts

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127 Open Source Seed Startups (July 2026) — Page 5 | VCBacked