Software :: Get Secure Alternative To 2k8 Rdp Server?

At my work we have a windows 2008 that serves as a "bounce pc" i cant find any better word (thats directly translated from the word we use in my language) What i mean by that is that if we want to access the server net and so on we first have to rdp to a w2k8 computer and from their ssh/rdp/www futher to admin. The few admin have their own account and can be logged on at the same time, also with the rdp client you can mount your local c: witch can be very useful when you need to transfer file to the servers (they don't have access to the Internet). Now im looking for a similar service but for linux, suggestions?

The client that you connect with should be available to as many platforms as possible?