Twine - Twine is an open-source tool for telling interactive, nonlinear stories.
Workona - A better way to work in the browser.
Ink by Inkle - ink is a popular open source scripting language for branching stories, designed for writers
Session Buddy - Manage Your Browser Sessions
Quest - Quest lets you create sophisticated text-based games, without having to program.
Toby - Better Than Bookmarks