[dtsingletary]

Parse's portal gets a great melding of form, function, and philosophy. http://www.parse.com

FullContact's portal has some nifty navigation on the documentation: http://www.fullcontact.com/developer/docs/

An honorable mention should goto the creativity behind Twitter's Field Guide: https://dev.twitter.com/docs/platform-objects

[caseysoftware]

Absolutely agreed on Parse. My only criticism is bookmarking doesn't work very well.

Mashery also puts together some solid docs via their iodocs system - https://github.com/mashery/iodocs/

[mattieuga]

What has been your issue bookmarking on Parse?