WhatsHisFace - Face recognition plugin for Netflix!
Face++ - API for face detection – also detects gender, age, pose
Facesoft - The world's most accurate face recognition algorithm
PhotoTime - Automatic face sorting & keywords tagging for your photos
Piwigo.org - Manage your photo collection with Piwigo. Piwigo is open source photo gallery software for the web. Designed for organisations, teams and individuals.
IrfanView - IrfanView ... one of the most popular viewers worldwide.