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Now entering its fourth year of publication, each quarter Runa Capital tabulates figures gleaned from GitHub and releases the Runa Open Source Startup (ROSS) Index, a global tracker of the fastest-growing open-source startups.In Q4 2023, European open-source startups accounted for 25 percent, arguably 30 percent, of the ROSS Index top 20 operators.These are the top five (six, including an honourable mention) fastest-growing open-source startups in Europe Q4 2023.1. Wasp — Zagreb, CroatiaY Combinator-backed Wasp is a programming language for building full-stack web applications including enterprise web apps with less code and best practices. The company was founded by Martin Sosic and Matija Sosic in 2020 and has raised $1.5 million from investors including HV Capital and Lunar Ventures.2. Tldraw — London, United KingdomTldraw is a collaborative whiteboard that requires no login. The app's blank canvas allows for the drawing of lines or objects, writing of text and insertion of media including images, videos, or GIFs. The free-to-use app was launched in 2021 and has raised $2.7 million in a Lux Capital-led seed round.3

TLDraw is a free and open source whiteboard tool that lets users collaborate without any account and lets developers build on it.