Found these 6 new adventures contained in a zip from this site :-
https://microheaven.com/airlock/
A1RL0CK, by Marco Innocenti
Blorp!, by Shawn Sijnstra
A Clean Getaway, by Michael Bub
The Fantasy Dimension, by Johan Berntsson
Lucid Night, by Dee Cooke
Submarine Sabotage, by Garry Francis
They cover many platforms, the Ti99/4a being one of them. I think the game Airlock has already been made available on here but the rest I cannot get to work, looks like they use the Infocom interpreter but maybe the main files are not available on the disk or not converted to TI99 format. Any help please?