This may not be what you’re looking for, but I use Mizage’s Divvy on Mac & Windows and configure Gnome to match on Linux. It can be keyboard or mouse driven — I exclusively use custom keyboard shortcuts.
I used to use Divvy (and have a paid copy), but I've moved to Rectangle which also does everything I need and is open source. It doesn't have the same "drag" mouse capabilities that Divvy does, but I don't end up using that too often.
