• Interneting is Hard (but it doesn't have to be) - Covers everything from CSS to typographyh
• HTML Cheatsheet
• Tessisamess' Code Tester - A life—(and time)—saver
• w3schools
• Realtime Colors - Visualizes website palette choices

• Easy Fanfic Library - Download fics from AO3 to Calibre with metadata intact
• The Fanfic Symposium - An archive of fannish "rant pages" spanning 1999-2006
• Fanhackers - OTW blog for fan and media studies. Includes a Bibliography on Zotero
• FicHub - Download fic in EPUB, MOBI, PDF, or HTML format. Perfect for downloading from Fanfiction.net
• How to recover deleted fic from AO3

• Digital Shred: Privacy Literacy Toolkit
• Digital Shred Workshop
• Internet Archive
• Open Library

Preservation

• Digital Public Library of America
• The National Archive's Citizen Archivist Missions - Help preserve history
• Twitter Media Downloader- Google Chrome extension to download images and videos from a Twitter media timeline

• YGOrganization
• YGOProDeck
• Yu-Gi-Oh! Deck Viewer - App for viewing .ydk files, developed by @gallantron
• YGO Omega - TCG simulator with Swiss rules
• Yugipedia