Danube Cloud is described as 'Cloud management software used for deploying, maintaining and automating cloud data centers and their processes' and is a Virtualization tool in the network & admin category. There are more than 10 alternatives to Danube Cloud for a variety of platforms, including Linux, Windows, Self-Hosted, Mac and Web-based apps. The best Danube Cloud alternative is QEMU, which is both free and Open Source. Other great apps like Danube Cloud are Proxmox Virtual Environment, KVM (Kernel-based Virtual Machine), OpenStack and SmartOS.