There are two games named Beetris. Both are Tetris clones with pieces made out of hexagons instead of squares, similar to Hextris.

This is the first game of Simsalabim Software, the authors of Frac and Frac4D. It runs without problems under XP on fast computers. The difference to Hextris is that the well is shaped like a Hexagon too.
This is essentially Hextris, with a rectangular well. It runs in Windows 9x and Win32s.