A startup out of Paris that began life building marketing tools has raised $22 million after making a successful pivot into billing -- a space it

Extracted from Runa Capital’s ROSS Index, a quarterly analysis of the top open-source startups ranked by the annualised growth rate (AGR) of GitHub stars at their repositories and based on Github stars growth of their repositories, these are the top 10 fastest-growing open-source startups in Europe in Q1 2023.1. Sismo - A Paris-based software development startup that issues ZK badges for reputation aggregation and privacy-preserving access control and enables users to aggregate their digital identities and selectively reveal data derived from their web2 or web3 accounts.2. Nebuly - This Turin-based startup promises to help others “unleash the power of optimization and make your AI systems thrive with performance”.3. Massa Labs - Another Parisian startup, Massa Labs is working on a cryptocurrency ecosystem designed for mass adoption and using Blockclique architecture to withstand thousands of transactions per second, while staying secure and fully decentralised.4. Lago - This Paris-founded startup is backed by Y Combinator and working on an “open source billing API for product-led SaaS”.5. Qdrant - Based in Berlin, Qdrant is a vector similarity search engine and vector database

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