I am aware of few of the resources which I've listed down below, will appreciate if you guys can share bit more. - https://hackattic.com/ : Interesting programming Problems. - Source: Hacker News / 12 months ago

Also check out https://hackattic.com/ it has some really fun problems. - Source: Hacker News / almost 2 years ago

What sort of programming would you like to do? Any real world challenges you are looking to solve? For practice “challenges” I really like https://hackattic.com/. Source: about 3 years ago

Isn't that what Floobits is? https://floobits.com/. - Source: Hacker News / 5 months ago

Think this might be what you want. Https://floobits.com/. Source: over 1 year ago

Floobits. Works with a lot of editors. Https://floobits.com/. Source: over 2 years ago

I have noticed Floobits which is a collaborative editing service. It integrates with a number of editors including neovim. What I like about that idea is that each participant can use their preferred editor with their preferred settings. I haven't gotten it running - when I tried there was a python dependency mismatch or something that I wasn't motivated to investigate. I might try again before the next time I... Source: over 2 years ago

I think Floobits is still a thing and supports neovim. Bonus is that it works across a couple different editors as well. Source: almost 3 years ago