I can give two options.

If you want purely manual tiling, with windows being arranged normally until you tile them, there is WinSplit Revolution (can't find the canonical link right now). It basically does the same thing the tiling keyboard shortcuts in Windows 7+ do, but with more options and granularity.

If you want automatic, dwm-style tiling, there is a project called [bug.n][1]. I am currently using it, mainly because besides offering tiling windows, it is also the least-bad way to get multiple workspaces on Windows that I could find.