Not sure if it qualifies as a "product", but .NET is (these days) uncharacteristic for Microsoft as well. It's community-driven, very active, and quite liked by the people who use it.

Somewhat more niche, I'd also add Access to the list. There is worryingly little development going on these days, but after all these decades there is no other product who came even remotely close to its quality. For quick local RDB stuff and some RAD, nothing is as quick and reliable. I still use it for all of my personal collection tracking, data modeling and prototyping for hobby projects, etc. The speed at which I can set up and adjust is unreal. I appreciate that LibreOffice are giving it a try with Base, but every time I try it, it takes me about 2 minutes until I find a basic, essential feature that's severely broken. (I guess I know which project I should start contributing to if I ever got into the mindset of doing some open-source work.)