LibreOffice - Base - Base, database, database frontend, LibreOffice, ODF, Open Standards, SQL, ODBC
Task Coach - Task Coach is a simple open source todo manager to keep track of personal tasks and todo lists.
My Visual Database - Using My Visual Database, you can create databases for invoicing, inventory, CRM, or any specific purpose.
Flashnote - Flashnote is a quick notes manager
Symphytum - Symphytum Project
Tot - Convert any text into a Trello task