Rigpawiki
Rigpawiki is a MediaWiki (Wikipedia) software based Tibetan Buddhism web site with now over 15 thousand articles. And the amount of articles as well as re-edits and insertion of material to the existing articles grow each week.
The beauty with a Wiki system are the constant updating as well as interlinks between the pages. You could click on single entries in the page or go to categories of information.
Most sites also have both Unicode and Wylie names and titles for the material, for example the Padmasambhava page. From this page then you could learn more about Dhanakosha, Kungamo and so on. You could find more info via Wylie searches in the search view as well.
There are also text titles for various collections and some links to TBRC and other text resources if want to find the original Tibetan text, for example check out the Chimé Pakmé Nyingtik page. Now, this is ongoing work for all the thousands of volumes available today. Also, there's no specific bias excluding any Tibetan tradition even if the web site is designed for the Rigpa students. I'm going to use links into Rigpawiki here at this blog for various definitions and Tibetan words -- and if it's missing then it's a good excuse to update the web site. Rigpawiki has also a Dictionary, for example GoldenDict could access this online resource.
Here's a fun link, I use this as my web browser home page: http://www.rigpawiki.org/index.php?title=Special:Random . Each time I open I web browser window I'm getting a random rigpawiki page and I might learn something new.