There are many alternatives to lsof for Linux if you are looking for a replacement. The best Linux alternative is htop, which is both free and Open Source. If that doesn't suit you, our users have ranked five alternatives to lsof and four of them are available for Linux so hopefully you can find a suitable replacement. Other interesting Linux alternatives to lsof are vtop (Free, Open Source), Sysdig (Free, Open Source) and Glsof (Free, Open Source).
Sysdig is open source, system-level exploration: capture system state and activity from a running Linux instance, then save, filter and analyze. Think of it as strace + tcpdump + lsof + awesome sauce. With a little Lua cherry on top.
Glsof is two separate utilities (Queries & FileMonitor) to the command line utility Lsof by Vic Abell. Both applications are written in Java. Another fundamental requirement is the command line Lsof that has to be installed on your system.
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Glsof vs lsof opinions
pros, cons and recent comments
GUI companion to lsof, not so much an alternative
this is Java code that gives some interaction to an otherwise pretty basic command showing open files "lsof"