In San Francisco, Tesseral, the open-source authentication infrastructure for B2B software companies, has revealed its emergence with $3.3 million in seed funding. Key investors encompass Y Combinator, Jessica Livingston, Paul Graham (Y Combinator co-founders), Calvin French-Owen (Segment's co-founder and ex-CTO), Steve Bartel, Nick Bushak (Gem's co-founders), and Mike Wiacek (Stairwell's founder). Authentication is crucial for B2B software security, and Tesseral aims to revolutionize this sector.