Culture Codes - Company culture decks aggregated all in one place
15Five Plus - Insights to manage, measure, and retain great employees.
Tettra - Tettra is a company wiki that helps teams manage and share organizational knowledge.
Comparably for Companies - See how employees rate their own companies
Culture Your Culture - Finally, the much needed step-by-step "how to" for culture
HappyMeter - A frictionless way to measure happiness and job satisfaction