When I first learned C++, I wrote AIs, which ranged from helper AIs, to full RTS AIs.
Group AIs were small AIs attached to units in the Spring Engine written in C++. Support for these AIs was removed in 2009. Here are some of the AIs I wrote in my spare time.
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An RTS AI started in 2005 for games built on top of the spring engine.
Toolkit is a point and click utility for editing NTai configuration files. It's written in C# and can be found in the NTai git repository at github.