The Runa Capital Open Source Startup (ROSS) Index for Q2 2025 reveals a vibrant and global landscape for open-source innovation, with a strong focus on AI and developer tools. The list of top-performing startups is a testament to the power of community-driven development worldwide.
Leading the list with a remarkable star growth rate is Union Labs from the United States, which showcases the immense potential of its platform. Following closely are other notable US-based startups like Linera and Sesame , both based in San Francisco and making significant strides in their respective fields. This highlights the continued dominance of the Bay Area as a hub for groundbreaking open-source projects.
While the US dominates the top spots, other countries are also producing promising companies. Singapore has a strong showing with Mindverse and DUIX , demonstrating a growing tech scene in Southeast Asia. Browser Use from Switzerland and Lightpanda from France represent Europe’s continued strength in developer-centric solutions. The presence of RagaAI from India further proves that the open-source movement is truly a global phenomenon.
These companies, alongside other high-growth startups like Prefect , Mastra , and Cherry Studio , are not just building tools; they are shaping the future of software development with a collaborative, open-source approach.
Ref: Top trending open-source startups in Q2 2025 - Runa Capital