I would like to collect a big list of good open source lecture notes for a course in
Such notes should be in
.tex format, that is, ready to be edited/modified/re-used and compiled using $\LaTeX$.
Here is a page with PDFs of three semesters of calculus notes and also one semester of Real Analysis. Zipped folders titled "source" of $\LaTeX$ code are also available for editing the notes. All free!!