Not exactly a dev-specific tool, but I created a mind map for storing all the interesting stuff I've read/want to read in different formats than just plain text

Not exactly a dev-specific tool, but I created a mind map for storing all the interesting stuff I've read/want to read in different formats than just plain text: https://mapsofmind.com https://mapsofmind.com No restriction on "topics" or "maps" or anything. Fully free to use.