I will track down those addons you mentioned and try to get them going on my OS9 machine. It isn't too rare an occurrence that an addon won't unstuff correctly and thus be doomed to unusability, but I'll give it a shot anyway.
In order of discovery (Cheat Category, A-Z by addons page name):
Aliens 1.2.0 (.sit.hqx) downloaded; failed to unstuff.
Death 1.0.0 (.sea.hqx) downloaded; failed to unstuff.
disco m failed to download; page full of gibberish.
EVOmega Taster (with space) failed to download; page full of gibberish.
EVOmegaTaster (no space) (.hqx) downloaded, expanded, works.
How to be a Conquerer (.sit) downloaded; failed to unstuff.
Invincible scoutship 1.0 failed to download; page with only "EV-Edit" written.
Invincibility 1.1.sea (.sea.hqx) downloaded; failed to unstuff.
untitled.sea failed to download; page full of gibberish.
Looks like I can confirm that they're all dead, unless you count the one upload of EVOmegaTaster (this one without a space in its name), which works. The one with the space is still a dead end though as far as I can see.
This post has been edited by U.E. Admiral : 26 November 2013 - 01:29 PM