ppchtex – Typeset chemical formula diagrams
ppchTeX is a separate module of the ConTeXt macro package for TeX. It seems to be in its final state (having not changed for more than 10 years).
Maybe you are interested in the following packages as well.
- context-typearea: Something like Koma-Script typearea
- context-vim: Generate ConTeXt syntax highlighting code from vim
- context-typescripts: Small modules to load various fonts for use in ConTeXt
- context-urwgothic: ConTeXt support for URW Gothic