microtex
Microtex is a name used for several lightweight TeX-related software projects, rather than a single canonical product. In general, microtex denotes small-footprint TeX engines or utilities aimed at constrained environments where memory, storage, or CPU time are at a premium.
Historically, various independent projects have used the term microtex on different platforms, including early personal computers,
Compared with modern TeX distributions like TeX Live or MiKTeX, microtex projects are not designed to be