15-210 SML Library Documentation
15-210 C++ Library Documentation
15-210 Style Guide (currently only SML. Will be updated to include C++ soon)
There is a thorough article on Jake Zimmerman's blog (a former 210 TA) that details how to get the most out of Vim when working in SML.
Additionally, the 15-150 Tools page has very useful information regarding SML, $\mathrm\LaTeX$, UNIX, and text editors.