See Meteor Docs for introduction to Meteor.
Read Meteor Style Guide for format and style of contributions.
Our core is being built with a preference for Coffeescript + LESS, but JavaScript is welcome in packages.
We try to always be using latest full release of all community packages.
For a high level review our roadmap, take a look at the vision page Reaction Vision
For grouping of development channels by feature see project milestones: https://github.com/reactioncommerce/reaction/milestones note: progress indicators highly volatile indicators at the moment
And finally for the kanban-esque, hardcore real time progress view, take a look our waffle board
For development tasks/issues please use the Reaction project issues. We're keeping this as the central issue tracking for all reactioncommerce:* packages. You can also view issues on our waffle board.