PointerSnapTo is freeware and runs on Windows 10/8.1/8/7/Vista/XP.
The current version is 1.21, released May 9, 2016. See the history for changes.
PSTSetup.exe and PST.zip both contain the same install program, the install program is just zipped up in the latter file. If you're not sure which file to get, download PSTSetup.exe.
The PointerSnapTo install file (for most users): Download PSTSetup.exe.
The PointerSnapTo install file, zipped: Download PST.zip.
For advanced users, a no-install, portable version, zipped (click here for more details): Download PSTportable.zip.
PointerSnapTo does not contain any spyware, adware, or viruses.