Bookmarks

Fanfics

Harry Potter and the Methods of Rationality
Holly Evans and the Spiral Path
NSFW in places
The Price of the Wish

Interactive Fiction

Ficdown
Markdown to gamebook - written in Mono, has an online converter
Ramus
HTML+JS framework for writing hypertextual stories
Squiffy
Styled markdown to HTML+JS gamebook converter - written in NodeJS, has an online converter

Webapps

FicSave
An open-source online fanfiction downloader
NoteHub
A pastebin for your markdown notes
Markup.rocks
A client-side app that lets you edit, preview and convert between documents written in various markup languages in your browser - based on Pandoc

Webcomics

Girl Genius
Gunnerkrigg Court
Ow My Sanity
On hiatus since 2011
Rain LGBT
Red Moon Rising
Steampunk meets fantasy