Web-Based Tasks Lists

TTD (Things To Do) server software

Software for storing lists of TTD (Things To Do) on a server, and helping users access, modify, and manage them via a website and/or desktop/ mobile/ cross-platform application.

Type	Proprietary examples	Free code replacements
Project management suites (with task lists)	Asana	Collabtiv (GNU GPLx3, LibrePLan (GNU AGPLv3, Taiga (GNU APGLv3)
Check lists	RemembertheMilk	'16 To-Do List Managers as Open-Source Web Apps' by Alex from CodeCondo
Kanban boards	Trello	KanBoard ("MIT"), WeKan ("MIT"),
Mind maps	Liquidchart	MetaMaps (GNU AGPL), XMind (dual licensed; EPLv1 and the GNU LGPLv3).

Notes on Software

• Wikipedia list of mind mapping software, both free code and proprietary
• 16 To-Do List Managers as Open-Source Web Apps from CodeCondo
• list of free code Kanban board software, from OpenSource.com

Task Management Theories

• David Allen's 'Getting Things Done' (GTT) system