Which will be future in Cloud? Cloud Stack Open Stack Eucalyptus

i think OpenStack, since it has a lrage community acceptance and Wide integration with storage, network and compute technologies than CloudStack

i agree with all here open stack no double has innteropratanbilty with even rivals which i would call a real open source. and this is what theh cloude is all about not have any issues paltform formats and be able to talk to maximum vender of hardware witout having to converting anything even on the fly.

as open source not only it has the wide supporters but it save tons on licenses and support is always just a forum away.

The need for interoperatibility between multiple cloud options and vendors for features like CPU and Memory bursting a private cloud from a public cloud will demand an open source cloud platform. All mentioned platforms are open source but OpenStack has a more organized community and support from major cloud players and that is why might be the future of open source clouds. 

Innovations might ofcource change the direction to other open source cloud platforms.

Thanks to everyone for explaining the fact nicely.