Everything is index cards
I wrote this post as an exercise during a meeting of IndieWebClub Bangalore.
Much of the knowledge-management software we use today is modeled after stacks of index cards. Here is a growing list of applications that are directly or indirectly digital recreations of processes and techniques commonly used with index cards in the analog world.
I’ll keep appending to this list.
HyperCard

Image credit: https://wiki.xxiivv.com/site/hypertalk.html
More information: https://en.wikipedia.org/wiki/HyperCard
Trello

Image credit: https://www.atlassian.com/blog/trello/trello-manage-team
More information: https://trello.com
Google Keep

Image credit: https://zapier.com/blog/google-keep-vs-evernote/
More information: https://keep.google.com
Scrivener

Image credit: https://startupstash.com/tools/scrivener/
More information: https://www.literatureandlatte.com
TiddlyWiki

Screenshot from https://zettelkasten.sorenbjornstad.com/
More information: https://tiddlywiki.com