Modules are extensions to ConTeXt's core functions.
There are not as many modules for ConTeXt as packages for LaTeX, because a lot of LaTeX package features are in ConTeXt's core.
Some existing modules:
- bibliography (m-bib)
- nath (AMSmath, see Math)
- PPCHTeX (chemical structure formulae)
- Flow Charts
- CWEB
File names of modules start with "m-", but third party modules (what you write, while it's not bundled with the main distribution) should start with "t-".