zzMesh is a cool screensaver with mathematicians in mind that illustrates a Delaunay triangulation which maximizes the minimum angle of all the angles of the triangles in the triangulation.
The above description is certainly simplified but regardless if you are a lover of math or not, it is a cool and extremely active screensaver.
Because some people have asked about the author both here and on other websites, Javier is a regular visitor and indie developer who creates screensavers and small apps and makes them available to you on MajorGeeks. You may not have heard of Javier before, but MajorGeeks has always supported the smallest of developers since 2001. As always, all files on MajorGeeks are scanned, tested, and reviewed.
You might also consider zzScreensaver Compilation or even the website themed zzMajorGeeks.