Open source X server for Windows, active project. Works very well with Windows Subsystem for Linux.
I researched all the alternatives. They are either tricky with lots of cognitive load (Cygwin/X) or ultimately quite expensive (the two popular-for-corporates offerings) if you want any kind of flexibility. VcXsrv "works" and is very "simple". Even though the documentation is sparse in the extreme. We use it to access a VPS, along with Putty, from Windows 7. Worth trying if you want to focus on business and your new VPS apps.
Another criteria -- VCXsrv is also active, measured by update activity in 2016. Thanks to the team for the work.
Our users have written 3 comments and reviews about VcXsrv, and it has gotten 20 likes