Funambol “Our vision is to harness and popularize the innovation that open source can bring to the new world of mobile 2.0 messaging. We believe this will spur important, creative and exciting new forms of mobile communication, collaboration and entertainment.
Started in 2001 as the Sync4j open source project, Funambol has grown to be the world’s leading mobile open source project, with more than one million downloads, supported by the largest global mobile community, and used by mobile operators, service providers, enterprises and OEMs/ISVs/ODMs everywhere”
They offer a free trial available through the link above - interesting ideas !