To list a few communities I would consider to be truth-seeking and with whom I have interacted: Chaos Computer Club, General Semantics, Quantified Self/​Biohacking, Radical Honesty, Perceptive Pedagogy, Debating (BPS-based), Wikidata and Skeptics.SE
To list a few communities I would consider to be truth-seeking and with whom I have interacted: Chaos Computer Club, General Semantics, Quantified Self/​Biohacking, Radical Honesty, Perceptive Pedagogy, Debating (BPS-based), Wikidata and Skeptics.SE