Open Source Startups

Twenty is a customizable CRM platform and internal application framework for technical teams. It provides a low-code/no-code toolkit allowing developers to build and adapt CRM systems without vendor lock-in, offering real-time collaboration features and API-accessible integrations.

5 investors

Wasp is a full-stack web framework that reduces boilerplate code and provides built-in structure for web application development. It helps developers, particularly those working with AI, build applications with less code and fewer security vulnerabilities.

5 investors

Webiny is an AI-programmable headless CMS platform that enables developers to build and extend content systems using AI and code, with ready-made apps including a CMS, website builder, and file manager.

5 investors

AuthZed provides authorization infrastructure that automatically evaluates access permissions based on team and organizational hierarchies, eliminating the need for manual permission syncing and background jobs. The platform serves enterprise software builders who need dynamic access control that updates in real-time as team memberships change.

4 investors

Lago is an open-source billing platform that enables companies to build and manage their billing infrastructure with transparency and control. The platform serves tech companies that need flexible billing solutions without the limitations of third-party black-box systems.

4 investors

Mem0 provides memory infrastructure for AI systems, enabling them to build lasting, contextual memory across applications. The platform serves developers and AI companies that need portable memory and personalization capabilities.

4 investors

Nango provides an integration platform that enables software products to connect with 800+ APIs through code-first integrations with built-in authentication and agent support. The platform serves developers and engineering teams building integrations at scale.

4 investors

Ollama provides a platform for building with and running open-source language models locally and in the cloud. It enables developers to quickly deploy and access models like Claude Code and OpenClaw.

4 investors

OpenReplay is a session replay and product analytics platform that enables product teams to record user interactions with web applications, identify friction points, and troubleshoot issues. The product serves software development and product teams across various industries.

4 investors

Optic generates OpenAPI specifications from test traffic and maintains their accuracy through automated schema testing and patch application. It helps API developers catch breaking changes and apply linting rules to their API documentation.

4 investors

Reflex is a platform for building and deploying enterprise applications in Python, combining framework, infrastructure, and data connectivity in a single unified system. It enables teams to develop, deploy, and manage production applications without fragmented tooling or multiple specialized roles.

4 investors

Replicate builds tools that make AI models accessible to software engineers through simple APIs and abstractions, similar to standard software libraries. The platform enables developers to use, deploy, and customize machine learning models as easily as working with conventional software packages.

4 investors

Alokai develops frontend software for ecommerce retailers to build fast, modern online storefronts using composable commerce and headless architecture. The platform provides ready-made components, integrations, and services that developers can use individually or together throughout the frontend development lifecycle.

3 investors

AnythingLLM is a desktop and self-hosted application that enables users to chat with documents, use AI agents, and interact with large language models—all running locally and offline for privacy. It supports multiple LLM providers and document types without requiring code, offering an open-source alternative to cloud-based AI tools.

3 investors

Cactus Compute provides an on-device AI runtime for speech, vision, and text models that automatically routes between on-device and cloud inference based on complexity and audio quality. The platform enables developers to deploy speech transcription, voice assistants, and LLM applications across mobile, desktop, and wearable devices with privacy-first architecture.

3 investors

CodeStream built a developer collaboration tool that brought code discussion, review, and issue tracking directly into the IDE, integrating with editors like VS Code and JetBrains. Acquired by New Relic in 2021.

3 investors

Common Paper provides contract templates and standards for technology transactions, enabling programmatic access to contracts through open-source standards. The company serves tech companies and legal professionals seeking to simplify contract negotiation and approval.

3 investors

Fern provides documentation, SDK generation, and CLI tools for APIs, built with AI features including integrated chat, MCP server support, and agent-first capabilities. The platform serves developers and AI agents consuming APIs across REST, WebSockets, and GraphQL protocols.

3 investors

Formance provides a platform for developers to build and integrate complex financial applications using composable, open-source primitives that can connect to any financial partner. The platform serves enterprise companies globally seeking vendor-agnostic infrastructure for financial workflows.

3 investors

GrowthBook provides a platform for running A/B tests and experiments on websites and products without requiring engineering resources. The platform serves growth teams and marketers who need to test ideas quickly, measure impact, and analyze results across the full customer journey.

3 investors

Lightdash is an open-source business intelligence tool that natively supports dbt metrics and analytics workflows. It provides dashboarding, analytics engineering capabilities, and AI-powered analysis features for data teams.

3 investors

Manufact provides a platform and open-source SDK for developers to build, test, and deploy MCP (Model Context Protocol) applications and servers for AI agents and chat interfaces like ChatGPT and Claude. The platform includes hosting, debugging tools, analytics, and publishing checks to help teams get their MCP apps to marketplace stores.

3 investors

Mattermost is a secure team collaboration platform designed to complement Microsoft Teams and Microsoft 365, providing on-premises or private cloud deployment with advanced customization, data control, and integration capabilities for mission-critical and highly regulated environments.

3 investors

Medplum provides a data infrastructure and interoperability platform for developers building healthcare products and services. The platform offers secure, compliant infrastructure to enable healthcare innovators to develop applications more efficiently.

3 investors