I have created Earned Value Management Web (http://evmweb.com), a collaborative system based on EVM. It has an "Integrated Changes Control" too. It is free for majority of users. Temporally the system is available in English and Spanish and is open to beta testers.
Like many other professionals, I discovered EVM while I was preparing my PMP certification test. I found that it is possible to implement an EVM system over many common project management systems even datasheets, possible but not probable. I had been slave of the datasheet for years. The efforts of implementing the system were comparable with benefits. I have found that those systems are not focused on EVM and I decided to create something more specialized. Sign up now. I hope to receive your opinion and your help to improve it.