Scrapbox - A new style of note-taking that lets you create, discuss, and learn together in one self-organizing space.
LibreOffice - Base - Base, database, database frontend, LibreOffice, ODF, Open Standards, SQL, ODBC
Evernote - Bring your life's work together in one digital workspace. Evernote is the place to collect inspirational ideas, write meaningful words, and move your important projects forward.
My Visual Database - Using My Visual Database, you can create databases for invoicing, inventory, CRM, or any specific purpose.
Unit Notes for iOS - A simple and powerful note-taking app.
MongoDB - MongoDB (from "humongous") is a scalable, high-performance NoSQL database.