Here is Serious Sam: Second Encounter (without data). You’ll need to copy the data from the original game (Steam, GoG or original CD version). Copy all the “.gro” files and all folders (but not the bin one) in apddata/serioussam1 to play. The game use gl4es, and use the recently open sourced Serious Engine 1. Brought to Pandora by ptitSeb.

OpenPandora - Serious Sam - The Second Encounter