I just released rufus-scheduler 2.0.12, a thread-based scheduler. The main new feature is a :mutex attribute to prevent overlapping among scheduled blocks.

JSON has nice railroad diagrams detailing its syntax, a Parslet-based JSON parser shouldn't be too much work. It could even make an introduction to Parslet.

Version 2.2.0 of ruote, a workflow engine, is out. This tool follows workflow definitions to route work[items] among workflow participants.

just released rufus-jig 1.0, a Ruby HTTP client that groks JSON (and has some helpers for CouchDB)

It started in a notebook and ended somewhere between state, rules, aspects and transitions to the door. It's called volute.

version 2.1.11 of ruote, a workflow engine has been released. Many updates are included, and the web interface, ruote-kit, got seriously reworked.

Sudhindra Rao and Munjal Budhabhatti explain in their "Rocking the Enterprise with Ruby" talk at the RubyKaigi how they are building (and delivering continuously) a system orchestrating Rackspace datacenters

rufus-json is a ruby gem that lets you choose your JSON {en|de}coding backend. It has a preference for yajl-ruby, but is happy with json, json-pure and active-support.

rufus-tokyo is a FFI (and more) library for Tokyo Cabinet|Tyrant. It's time to retire it, there are better options now.

In ruote and decision tables, I show how to make ruote workflows and rufus decision tables work together.

Granted, you can do workflow with state machines, but there's still work to do in order to have a "workflow engine". There are also alternatives. The post "state machine != workflow engine" answers some questions and open up some more. At least, a set of links to Ruby state machine implementations concludes the post.

rufus-scheduler 2.0 a rewrite of rufus-scheduler (cron, at, in, every scheduling from within ruby). Now comes with an EventMachine mode.

rufus-decision 1.1 was just released. Decision tables are an elegant / naive way of representing some domain logic. Rufus-decision interprets decision tables (in their CSV representation) and produces an output based on matching fields in the input data.

rufus-lua embeds Lua inside of a Ruby application, via Ruby FFI.

rufus-tokyo is a ruby gem for handling Tokyo Cabinet databases. It's based on the ruby-ffi gem (mri, jruby and rubinius) and makes cabinets look like hashes. Version 0.1.0 has just been released. Source is on the GitHub.