I just released version 3.0 of the Roots mod. The Roots Mod is the only Armada II mod out there with its own original single player missions, and it builds on the gameplay and graphical enhancements that come from the Fleet Ops project. Version 3.0 comes with many (bug) fixes and improvements, including 3 new single player missions. It now has 19 original single player missions, 1 bonus mission that's a remake of the first Armada I mission, and 4 of the missions are multiple missions in one because you get to choose from 2 or 3 races (with different starting positions) at the start of the mission.

It is a standalone installation, all you need is a valid armada2.exe, for example form the GOG version of Armada II.

The mod's main page can be found here,
and a direct download link here