This is a detail, but in some instances I don't know right away how words from the world of TeX & friends are properly capitalized. While it's not necessary or "acceptable" to edit a post only to fix capitalization (unless it's near the top of the active questions anyways), capitalization often gets fixed along with other things (cf. When is it (and isn't) acceptable to edit?). Hence, I thought it'd be good to have a reference here to come back to.
I'll start with one CW answer with categories of terms and preferably a source of the capitalization.
To add on the motivation behind this a bit: A part of the Stack Exchange model that I really like is its Wiki aspect. Not only do we help people solve their actual problems, but we also build up a database of knowledge for everybody to access. Decently understandable language and proper capitalization just underline the professional and high-quality impression that tex.sx has, which can really make it stand out from other web sites on the world wide webz.