Kisi - Cloud-managed keyless access for the office

Google Docs - Create a new document and edit with others at the same time -- from your computer, phone or tablet. Get stuff done with or without an internet connection. Use Docs to edit Word files. Free from Google.

doorbot - The Wi-Fi enabled doorbell for smartphones

Airborn - Create and edit documents online without sacrificing your privacy

Nold - Nold offers a smartphone based access control system for both personal and business use.

Bit.ai - Bit is a smart real-time document collaboration platform for teams to create interactive documents, manage digital content and track document insights.