Linux groupware doesn't have to be ugly and Bitrix24 proves it. Bitrix24 is a new generation of groupware, known as unified collaboration
platform, meaning that all the tools you use to communicate and collaborate with your co-workers are available to you in single place and are accessible from one interface. Bitrix24 groupware
server is built specially for Linux, but you can use it in the cloud as well, if you don't want to bother with setup.
* Please note that the information may have changed since the publication. For current prices and features please visit Bitrix24 pricing page.