Open Source Startups

Requestly is a Git-native API client for teams to design, build, and test APIs in a single local-first application. It serves software developers at Fortune 500 companies and offers features like REST and GraphQL support, environment management, and collaboration tools with enterprise-grade security.

1 investor

RethinkDB is a distributed document database that enables developers to query JSON documents across multiple programming languages and integrates with modern web frameworks for real-time applications.

1 investor

Riften provides a routing layer that sits between a company's applications and large language model APIs, directing each request to the least expensive capable model and using self-hosted open-weight models where possible to reduce inference costs. It also uses the resulting task data to train private, company-owned models on recurring work, serving businesses that run AI-powered applications.

1 investor

Rivet provides infrastructure for AI agents and realtime applications, offering stateful compute primitives called Actors that run in Node.js or Bun backends. The platform supports deployment options ranging from local libraries to fully managed cloud services or self-hosted environments with compliance features like air-gapped and on-premises support.

1 investor

Robocurve develops open-source tools and benchmarks for evaluating the real-world capabilities of AI systems and robots. The company serves robotics labs and the broader public by providing independent, rigorous evaluation frameworks to assess progress in physical AI and general-purpose robotics.

1 investor

Rowboat Labs builds an open-source AI assistant that runs locally on users' computers to help with workplace tasks like email drafting, meeting preparation, and project management by maintaining a knowledge graph of their work data. The tool integrates with various applications and supports custom extensions for personalized workflows.

1 investor

Rownd AI manufactures fully autonomous drones equipped with edge-based intelligence and satellite/cellular redundancy to remove operator dependency, currently deployed with U.S. Special Operations Command and commercial enterprises.

1 investor

The Sails Company develops open-source web and mobile frameworks alongside professional services for server-side development using JavaScript and Node.js. They offer consulting, design, and implementation support to help developers and organizations build enterprise-grade applications more efficiently.

1 investor

Skyvern automates browser-based workflows using AI and computer vision, handling tasks like logging into portals, filling forms, and extracting data without APIs or custom scripts. It serves enterprise teams and developers automating repetitive portal interactions, data extraction, and compliance processes across industries.

1 investor

A desktop application that tracks team productivity and helps groups maintain focus on product development and delivery.

1 investor

Superagent provides autonomous security research to identify, fix, and disclose software vulnerabilities in code and AI agents. The platform delivers patches as pull requests for software teams to review and deploy.

1 investor

Superlog provides AI-driven observability that automatically identifies, investigates, and fixes issues in software by analyzing logs, traces, and deployment history to propose pull request solutions. The platform instruments code with OpenTelemetry, consolidates related errors into single incidents, and delivers actionable fixes directly to developers via Slack.

1 investor

SuperTokens is an open-source user authentication platform that enables developers to add authentication infrastructure to their products within 15 minutes. The company provides robust user management and authentication services to engineering teams building applications, following an open core model with free base features and paid enterprise capabilities.

1 investor

Tensil develops software that automatically designs hardware accelerators for machine learning models, helping customers optimize performance and power efficiency compared to standard GPUs and accelerators.

1 investor

Tesseral is an open source platform that provides identity and access management for business software, with features including single sign-on, user provisioning, role-based access control, and audit logging. It serves organizations managing access for employees, customers, services, and AI agents.

1 investor

Tipe is a headless content management system designed for developers, offering schema-based content modeling and framework integrations for building web applications.

1 investor

Tiptap is a headless, open-source editor framework that enables developers to build customized text editors with extensions for collaboration and AI capabilities. It serves developers and enterprise teams building applications that require rich text editing functionality.

1 investor

Tracecat is an open source security automation platform that enables security teams to build AI agents and automate incident response workflows across their security tools. It replaces legacy SOAR systems by allowing analysts to create custom agents that triage alerts, correlate telemetry, and execute containment actions across SIEM, EDR, MDM, and identity platforms.

1 investor

Tracer is a research lab building Echo, an inference system that coordinates open-weight models behind a single OpenAI-compatible endpoint for chat, code, and agent workloads. It focuses on allocating computation and coordinating complementary models to improve performance per token for teams running AI in production.

1 investor

TrustAI provides workflow automation software that captures and distributes organizational knowledge and instincts through AI-driven suggestions, with transparency and human oversight. The platform enables teams to automate repetitive tasks while preserving judgment and expertise across the organization.

1 investor

Tusk is an AI agent that automatically generates unit tests for pull requests by understanding codebase and business context. The product helps software engineers save time on testing work.

1 investor

Understudy Labs offers an open-source toolkit that captures traces from LLM production workflows, benchmarks and A/B tests cheaper or open-weight models against them, and fine-tunes and deploys specialist models that users own and can host anywhere. It is aimed at developers and teams looking to migrate from proprietary LLMs to models they control.

1 investor

Vendo offers an open-source customization layer that lets a software product's end users build their own features and micro-apps on top of it, describing what they need so the interface assembles live components, actions, and automations. It reads a product's repository to learn its components, API, and permission rules, running sandboxed within existing user permissions, and offers a paid cloud tier for multiplayer collaboration, publishing, and governance.

1 investor

Vibe Kanban is a project management platform designed for teams working with AI coding agents, enabling parallel agent workflows and human review of AI-generated code. It provides tools for organizing work, managing multiple coding agents simultaneously, and reviewing automated code changes.

1 investor