https://www.streamlit.io – A pure Python ecosystem to build data frontends for your research. Similar to: Jupyter Notebooks.
https://seek-oss.github.io/capsize/ – CSS tooling to bind fonts into predictable sizing or something like that.
https://github.com/tomhodgins/quark – Microscopic CSS polyfill.
https://blitzjs.com/ – Fullstack React framework. A Next.js competitor, I guess?
https://www.prisma.io/ – Open database toolkit for Node.js and Typescript.
https://www.codingwithjesse.com/blog/sapper-is-dead-whats-next-in-svelte/ – Sapper, a Svelte development framework, turns out to be a bit dead.
https://martendb.io/ – .NET transactional document DB and event store built on on PostgreSQL.