lsof is described as 'Commandline tool showing open files for running UNIX processes' and is an app in the File Management category. There are six alternatives to lsof for a variety of platforms, including Mac, Linux, Windows, BSD and iPad. The best alternative is htop, which is both free and Open Source. Other great apps like lsof are vtop (Free, Open Source), Sysdig (Free, Open Source), Resource Monitor (Free) 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.
Resource Monitor is a system application in Microsoft Windows operating systems. It is used to view information about the use of hardware (CPU, memory, disk, and network) and software (file handles and modules) resources in real time.
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"