lsof is described as 'Lsof lists open files for running UNIX processes. It is a descendent of ofiles, fstat, and lsof versions 1, 2, and 3' and is an app in the file management category. There are eight alternatives to lsof for a variety of platforms, including Linux, Mac, Windows, BSD and iPad apps. The best lsof alternative is htop, which is both free and Open Source. Other great apps like lsof are witr, vtop, Usage and Sysdig.
htop is an interactive process viewer for Linux. It is a text-mode application (for console or X terminals) and requires ncurses. htop is an interactive top replacement that runs in the terminal. The available columns are: PID, STATE, PPID, PGRP, SESSION, TTY_NR, TPGID, MINFLT...
CLI diagnostic tool for tracing processes and their causal ancestry, explaining origins, supervising service, context like directories and containers, risk signals, with support for Linux, macOS, Windows, FreeBSD, platform-specific inspection, JSON output, and open licensing.
vtop is a graphical command-line tool that uses unicode braille to chart CPU and memory usage. It can be easily extended.
lsof ==> list open files vtop display running processes
System Activity Monitor for Mac, iPhone, and iPad. Customizable, precise, and lightweight apps to keep an eye on the activity and performance of your devices.
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.
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.
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"
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lsof ==> ls (list) of (open files) top/htop show processes which may or not have files associated