The CTAN edition of Graham Williams' LaTeX Catalog Online lists and describes briefly many (La)TeX tools and packages, most of them available on CTAN.
Before asking for help, check the LaTeXbugs database.
Bug reports include the problem statement and examples that trigger the bug, as well as (possibly) discussion, workarounds, and, for bugs that have been resolved, a statement of what was done and the applicable LaTeX version.
Topics covered (among others): LaTeX, AMS-LaTeX, Babel, Graphics and color, PostScript fonts, and Tools.
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Questions regarding TeX, LaTeX and friends are categorized by topic, with questions and answers voted by participants for relevance and usefulness. Visit the questions page to view the archives.