You can show free memory on a Linux system with the free command, like this: free. If you prefer to see information in MB you can use the -m parameter.
If you'd like to see a real-time view of the memory use of applications running on your system you can use the top utility by just typing top at the command line.
Keeping with the "memory" theme of this blog post, type a capital letter "M", and top will sort the output by memory used by each running process. After you've seen everything you need, just type "q" to quit the top utility.
In a related note, this article shows how to sort Linux ps command output by memory use.
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