Searching for mods (looking for mods for Tribes of the East).

Stronghold from Heroes 3 (replaces Barbarians)

Thread about the mod.
The link isn't in the first post; it's buried. Here it is.

2) Replacing Nightmares with Ifrits for Inferno.

Also available on hc. Like the previous mod, it's in English. However, I see that you want to replace Nightmares specifically... Unfortunately, I don't know of such a mod, but it's not too difficult to modify one mod into another.

5) Replacing Zombies with Ghouls.

I know of a replacement with Mummies.
Direct download link.

I would recommend searching for the rest on heroescommunity. This site is usually the primary source for mods for the fifth game. However, everything is in English.