See the download page for latest official releases of TresEd and GeomAdd.
Latest test releases:
Much improved terrain editing, transparent triggers and RGBA textures, some bugfixes (including an option to not save trigger partitions, they are sometimes problematic).
Utility to help generate Trespasser Scripts (screenshot).
SWPz: Utility to compress and decompress Trespasser texture files (.SWP and .SPZ).
TPAAdd_2002-12-06: Experimental utility to add new sounds to TPA (Trespasser Audio) files, and rename sounds (so that unused sounds can be used in TScript). [NOTE: Program must be run from a DOS prompt as it requires multiple parameters]
MakeSCN: (Old test, newer version is now integrated into TresEd) Beta test of utility to make edited/new levels run faster (creates spatial partitions in the SCN files).
TpmImport v0.0: (See main TresEd download page for new version) Alpha test of MAX script to import TPM files.