MySQL - The world's most popular open source database
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.
PostgreSQL - PostgreSQL is a powerful, open source object-relational database system.
Bit.ai - Bit is a smart real-time document collaboration platform for teams to create interactive documents, manage digital content and track document insights.
SQLite - SQLite Home Page
Apple iWork - iWork is an office suite by Apple.