'Write Once, Run Anywhere' is what Java offers. J2EE is object oriented, architecture neutral, multi-thread programming language. J2EE is Java's one of the latest offering for enterprise computing. DigitalBytes Inc has been working with this J2EE technology since its inception. Most of the employees/consultants of DigitalBytes Inc are Sun certified.
There are number of J2EE based application servers and many of them are J2EE compliant. Following is a partial list. This list may include non-J2EE based application servers.