TaskForest
A simple, expressive, open-source, text-file-based Job Scheduler with console, HTTP, and RESTful API interfaces.
About
Commercial TaskForest Support
Several of the features currently in TaskForest are a result of user requests. If you would like to see a feature implemented, please send me a message via the TaskForest SourceForge page.
The only company I know of that provides commercial support for TaskForest is ActivMindz, Inc.