Entropy is described as 'Easily create, open and preview popular archive files like ZIP, RAR, 7z, TGZ and more ( 30+ formats supported )' and is a File Archiver in the File Management category. There are more than 50 alternatives to Entropy for a variety of platforms, including Windows, Mac, Linux, Android and BSD. Most alternatives are File Archivers and File Compressors. The best alternative is 7-Zip, which is both free and Open Source. Other great apps like Entropy are PeaZip (Free, Open Source), WinRAR (Paid), Bandizip (Freemium) and Keka (Free, Open Source).
File Roller is the archive manager of the GNOME desktop environment. It can extract, view, create and modify archives. File Roller is only a graphical interface to archiving utilities such as tar and zip.
p7zip is a port of the command line version of the 7-Zip file archiver to POSIX-conforming operating systems like Unix (Linux, Solaris, OpenBSD, FreeBSD, Cygwin, AIX, ...), MacOS X and also for BeOS and Amiga.
Ark is a program for viewing, extracting, creating and modifying archives. Ark can handle various archive formats such as tar, gzip, bzip2, zip, rar, 7zip, xz, rpm, cab and deb (support for certain archive formats depend on the appropriate command-line programs being installed).
B1 Free Archiver is a free multi-platform universal archiver. Currently it works on Windows, Mac, Linux and Android; moreover B1 Online Archiver allows you to uncompress .b1, zip, rar or .7z archive from your computer directly online.