• ASTRO.BY - REX memory image of the very high quality Asteroids clone recovered by Gary from a Booster Pak ROM. This is far and away the slickest-running M100 game I've seen. Contains the bootstrap program which displays instructions and CALLs the already in-memory game.
• BG31.BY - REX memory image of the "Baldur's Gate 3" demake for easier loading on modern m100/t102 systems. Instructions are within the ZIP file.
• ERRORS.DO - List of Tandy Model 100 BASIC error messages, their meaning, and numerical value. (ASCII)
• MINIFY.ZIP - BASIC minification (aka "compression") utility typed in from The Model 100 Companion. MINIFY.BA within is the main program. It's not quite as featureful as the .MIN command in Cleusau, but it's almost as good and has interesting source code.
• TSD101.BX - TS-DOS 4.10, REX/ROM version - Patched by Kurt McCullum with Ken Pettit's page down fix. It's the same as the TS-DOS included in SARDOS, but I don't have a functioning Sardine setup so I just use this.
• DOS100.CO - TS-DOS 4.10, RAM version - Patched by Kurt McCullum to fix the shift-down paging problem. This is in my opinion the "best" of the many available different versions of this file.
• TSL100.DO - TSLOAD for running TS-DOS "RAM VERSION" from disk rather than leaving the program in RAM storage and using up your precious memory on storing the file. Place DOS100.CO on the TPDD target and TSLOAD will load it from disk and run it. (Untokenized ASCII BASIC so you can LOAD"COM:98n1d" to bootstrap over serial)
• ZBG.ZIP - Radio Shack's ZBUG Assembler for the Model 100, found on the Wayback Machine archive of xibalba. If the manual is to be believed, it was licensed to Tandy by Microsoft.
• M100_ZBGASM.pdf - The manual for ZBUG Assembler in PDF form. This is a Radio Shack manual.
• DIS.BA - A disassembler that may or may not be part of ZBG, that I happened to find adjacent to it.
• CD.BA - Change TPDD directory from within BASIC. TS-DOS not required. Use the magic directory name PARENT to go up a level. By me. (Tokenized BASIC)
• SETIME.BA - Set the date and time interactively, from Jim A. on the mailing list. (Tokenized BASIC)
• ELD.DO - Dice roller program for Eldritch Horror, a tabletop board game. By me. (Untokenized ASCII BASIC)
• ROSHAM.BA - Roshambo Rampage v1. It lets you play roshambo against the computer. Great for decision-making! By me. (Tokenized BASIC)
• MOON.BA - A lunar lander game typed in and polished a bit from Usborne's Computer Spacegames book. (Tokenized BASIC)
• BUGS.BA - A wak-a-mole alike game typed in and polished a bit from Usborne's Computer Spacegames book. Press 1,2,3, or 4 to whack the appropriate bug. (Tokenized BASIC)
• PERIOD - The PERIOD demonstration program by Frank Durda, originally written to demonstrate the TRS-80 Model 100. Tandy elected not to use the program. (Untokenized BASIC)
• TPDD_SM.ZIP - Service manual for the Tandy Portable Disk Drive, RS 26-3808. (ZIP containing a PDF)
• mComm-repackaged.tar.gz - mComm Python TPDD emulator, by Kurt McCullum. Repackaged for easier installation on non-Debian platforms.
• mComm-Python-docker.tar.gz - mComm Python TPDD emulator, by Kurt McCullum, source for building Docker containers
• tandy.terminfo - the most comprehensive of the various terminfo files floating around for the 100/200
• TSWEEP.BA - Text Sweeper is a minesweeper game. This is version 1.1, culled from the mailing list
• 8201A-users-guide.pdf - User's Guide for the NEC 8201A, high quality scan, rescued from a login-required archive site.

Also of note: My complete mirror (combining multiple snapshots over time, fixes to the site and missing downloads, and removal of most scripting) of archive.org's snapshot mirror of the xibalba file archive, which includes some stuff that's harder to find elsewhere for various reasons.

Also also of note: The "Living" M100SIG archive which is an attempt to take the original CompuServe SIG archive and, rather than preserve it as a snapshot in time, continue to update the contents with fixes and to fix things that are broken or unusable. Ancient or difficult archive formats are unpacked, corrupt files repaired or flagged, and generally just the whole thing improved a bit at a time. I've done a bit to contribute.