Please post your CMS as a Show HN when it's ready. Email [email protected] for some tips about how best to do that. (Same offer goes for anyone.)

Edit: oh wait, I posted them here: https://news.ycombinator.com/item?id=22336638

As far as setting up/integrating into your development environment, providing good and accessible documentation (both tutorials and references) and an opening community - I gotta go with Rust.

Vue.js and the surrounding ecosystem vue-cli, vuex, etc... is killer.

Webdriver.io has been pretty good with onboarding QA engineers. wdio-cli, install additional services plug and play, excellent documentation to the point where very low coding experience QA can get a project up and running easily.

They have a Gitter also that is one of the more active I've seen. I see people from other OS projects come and ask questions because they're more likely to get a faster response in wdio's than other OS.

Spring, the documentation is so good and detailed

Have been fond of getSentry’s onboarding + team member invites with the ability to easily copy an invite link to team members.

i was quite impressed with https://www.metabase.com/, good documentation and a lot of effort to make production level setup very easy

Wordpress is famous for its easy guided setup.

Firefox is pretty decent.

Django has a strong intro in tutorial form.

Autohotkey