Newer versions of OllyDbg never caught on and a stable working x64 version has never hit. The main community for Olly sort of died with XP 32-bit unfortunately.

Newer versions of OllyDbg never caught on and a stable working x64 version has never hit. The main community for Olly sort of died with XP 32-bit unfortunately. x64dbg has largely replaced it for 64-bit code and many of its common features and plugins for 32-bit code on 64-bit OSes too. Unlike Olly, x64dbg is also open source, which has lent to some interesting features, though it's still largely the work of Mr.Exodia as far as I know. Of course, debuggers like x64dbg fit a niche for when you need to do a lot of dynamic work, like dumping data or unpacking an executable, they're not static analysis tools like IDA or Binja, which you'll probably want if you're analyzing algorithms and trying to understand the inner workings of something. EDIT: I have a [dead] reply saying everyone moved to Immunity that I'd like to respond to. There's some truth to that in some communities, but the catch there is that Immunity never got good x64 support either. To my knowledge, it's basically just an Olly fork with some additional scripting features and stuff, doesn't solve the 64-bit problem or the 32-bit on 64-bit OSes problem.