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 NVIDIA vGPU 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.