QuestDB

QuestDB is one of the fastest-growing time series databases. It is open source and the team is obsessed with performance, using a blend of low latency zero-GC Java, C++ and Rust for the entire distributed architecture. The company is VC funded with investors including YCombinator, and founders of Github, Docker, Supabase, Posthog, NGINX, Mesosphere, Citus Data and more.