The {linguistics} tag can be used for questions about packages designed primarily for linguists or about typesetting of linguistics-specific material.
LaTeX is quite useful for linguistics work, and there are a number of packages designed with linguistics in mind, some of which have a tag of their own.
Numbering Linguistic Examples and Glossing
gb4egb4elinguexlinguexcovingtoncovingtonexpexexpexleipzig(shortcuts for gloss abbreviations, can build a list of abbreviations if used withglossaries)textglos(in-line glossing)
Trees trees
forestforesttikz-qtreetikz-qtreetikztikz-trees tikz-pgf (forestandtikz-qtreeusetikzunderlyingly, but you can create trees with it directly as well)qtreeqtreepst-jtreexyling
tipatipa (for use with regular LaTeX)- SIL Fonts (for use with XeLaTeX and LuaLaTeX)
libertinelibertine (for use with regular LaTeX)- Linux Libertine libertine (same fonts as above, for use with XeLaTeX and LuaLaTeX)
- Brill (for use with XeLaTeX and LuaLaTeX)
Optimality Theory Tableaux