Username or EmailPassword
I don't know a single source of templates, but Googling usually turns up what I need. For resumes specifically, I use this one on my own resume: http://www.iro.umontreal.ca/~csuros/latex.html
You'll need the 'resume.cls' file that comes with it. If you're using a CLI latex tool, you can just put it in the same directory as the source file and it'll find it. Speaking of CLI latex tools, I personally prefer pdftex (command: pdfelatex), because its control over stuff like margin kerning, plus its ease of use.