I played a good amount of Warcraft II, but far more of the C&C series. Well I'm not sure if the hacked exe allowing building paradrops on purpose was ever incorporated into the regular install. I made map mods for both where you can play as all four teams: GDI, Nod, Allies, Soviet. Here's some stuff already possible with CNCNet's edition of RA1 and the stand alone game Red Dawn 2014 based on it (RA1 converted to original TD).

Ever since Red Alert 1 you could do a lot of customization just by editing rules.ini and/or putting the changes into a map, kinda like Dehacked, except not being able to manipulate specific frames of animation (In setting a unit to use C&C1 unit gfx, you had to pick a unit with the same number of frames, though there has been a hack allowing units to be added). The Red Alert 1 installs are also further enhanced with an additional mix file of original C&C (Tiberium Dawn) unit graphics that can be accessed with map-contained mods (modified rules). For years, has been the best place to go where you can download the whole patched up games with their complete campaigns, or quick compact multiplayer/skirmish installs. People are really going to have a field day with this.

For those unaware, the classic games have been otherwise released totally free for years, and have been hacked extensively to make them higher res and run fine on modern computers with great online multiplayer, to the extent of being kinda like source ports though so far without actual source modification. It's a partial release but excellent news.

Download games like command and conquer