OpenWFEru (“Rufus” for short) is an open source Ruby workflow and BPM
It’s a tool for interpreting and playing [business] processes.
There is an example integration of the workflow engine within a Ruby
on Rails application at http://difference.openwfe.org:3000
OpenWFEru also comprises a Scheduler (cron / at) which can be used
independently, see http://openwferu.rubyforge.org/scheduler.html