Advice for Third Party IPMI & KVM over IP

I have a rack full of IBM X-series and Supermicro Servers with the odd SUN that will be decommissioned and not relevant. Both IBM and Supermicro has built in IPMI.

Is there any third party IPMI with KVM over IP feature software available that will administer both the IBM and the Supermicro servers.
It is crucial that I can access the boot menu on these servers and that is my primary concern, therefore the KVM option is compulsory.

I cannot continue with Supermicro’s IPMIView as it is Java based and a pain to get working even if Java is installed and quirky as hell.

Secondly, also if you know of a good KVM over ip solution for IBM X-servers only if the above combination software doesnt exist…