Linux man-pages is described as 'The Linux man-pages project documents the Linux kernel and C library interfaces that are employed by user-space programs. This package contains over 1,900 man pages' and is an app in the OS & Utilities category. There are four alternatives to Linux man-pages for Linux, Mac, Online / Web-based and Windows. The best alternative is TLDR pages, which is both free and Open Source. Other great apps like Linux man-pages are cheat (Free, Open Source), Kommandr (Free, Open Source) and bropages (Free, Open Source).
Cheat allows you to create and view interactive cheatsheets on the command-line. It was designed to help remind *nix system administrators of options for commands that they use frequently, but not frequently enough to remember.