First paragraph, second sentence:
"Not a framework, nor bound to any specific use case, environment or even language, it's a vast and mature set of complementing code libraries, which has organically grown to approx. 250 sub-projects"
As for the topic search: The search box says "search by topic" (fuzzy search) - the tags in the tag cloud are all clickable. Is that really not obvious (even though it's also mentioned in the text)? Click on "typescript" to only show typescript projects etc.
As for the example projects. This is also explained in the text. This work is ongoing. There're another 150 or so projects to be added (just my own). For community submissions there is & will be: http://awesome.thi.ng/ (currently just linking to the submission form)