IMHO: Vercel/Next.js and their wonderful changelogs and documentation. Probably the "coolest" tech company in my book.

Cloudflare, who almost single-handedly pushes the CDN industry ahead. So much respect for what they do and how they explain it in easy to understand terms.

IntelliJ family of IDEs and their extensive release notes and forum discussions; it can be a bit overwhelming and disorganized at times though

My personal favorite headless CMS: DatoCMS, small company but highly involved devs and iterating very quickly

Google USED to be really good at this long ago, but since Alphabet, they've become less and less transparent and more and more evil

Airtable, for bridging that gap between Excel and a proper database, with a heavy focus on UX and great release notes