LIXA, LIbre XA, is a free and open source XA transaction manager
...LIXA implements even XTA: XA Transaction API, an innovative API that implements XA transactional context passing among different applications.
LIXA is a Transaction Manager but it's not a Transaction Monitor: this is the distinguishing feature of the project. LIXA technology enables every application container, like a web server or a shell, to become a two phase commit application server. The client/server architecture of LIXA allows many application containers to share a single LIXA (state) server: this is ideal when horizontal scalability is a must and many identical application containers must refer to a single transactional environment.
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PyTask is a job queue written in python using XMLRPC. Its target is to queue the heavy jobs that a application server may need, heavy reports, background jobs where is not so easy ( apache/php ), mailings without saturing the queues of a smtp server...
ActiveGrid is an Enterprise Web 2.0 solution that allows the composition of code-free applications that comply with corporate IT standards. Technologies include Python, Java, XForm, Xpath, WSDL, CSS, XML Schema (XSD), XACML, and BPEL.