I'm the main developer of the Sublime's RestructuredText plugin. https://github.com/dbousamra/sublime-rst-completion
ReStructuredText is a lightweight markup language to produce any kind of document in different formats. Like Markdown, it's designed to be easily readable by humans, but (IMHO) it's much more powerful (but a bit more verbose) . restructuredText is the "de facto" markup to write documentation in Python based Project
The plugin is developed in ST2 but has an ST3 experimental support.
Would be a pleasure to read your feedback, ideas and pull requests