Not OP but I like the question haha. I'll throw out two (though the first one is a bit of a cheat answer):
Desmodus Versio - never thought a reverb could be so "playable." It responds so well to modulation and can add a ton of character to simple sounds. I also really love NE modules and their Versio platform, it makes this thing incredibly versatile. Have also enjoyed the Melotus (granular) and Ruina (distortion) firmwares!
Mutable Instruments Tides (v2) - a much simpler and more straightforward module but seems to find its way into almost every patch I build. This was one of the first modules I bought, to add some external CV into my semi-modulars. It can act as an LFO, envelope/cycling envelope, and as an oscilattor (which sounds way better than it has any right to). Fantastic little swiss army knife that is simultaneously intuitive and deep.