I am currently writing the friendship track for female and non-romancing male PCs (she'll be your mate as long as you don't annoy her too much to begin with) for my mod, Fade. She already has some friendship interjections added, though. Some of the friendship talks are amended early LTs, but most will be (or are intended to be!) unique to the friendship track.
Elysia
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I've been looking forward to this mod. I'm happy to hear the friendship track is coming along.
As for friendship NPC mods, well, my own mod is primarily friendship oriented: Phenalope is an NPC thief who will become friends with either gender and any race and alignment. She will not be romanceable, so you don't have to worry about her interfering in any NPC romances.