Trello

Question1: List all options but differentiate present/absent (e.g., green/red -- but better colorblind alternative; like first option)? OR only list the present options (like second version)?
Question2: Just list the options (like first version) or make them links to collection of all those that have the option (like second version)?
Rights: GDPRno registrationopen sourcerecommendedsufficiently freeTUM

Collaborative kanban boards, with attached files. For list-making and task management. Integration with many other apps and tools. Mobile and desktop versions.

Commercial tool with very broad basic version; registration required. Released 2011.

10 users and 10 boards
$60/year
checklists, larger files, more boards, custom fields