Detect It Easy - Detect It Easy - Simple software to analyze a file, determine its type and packer
File Roller - File Roller is an archive manager for the GNOME desktop environment.
YARA - Yara is a popular tool that finds its use in helping researchers to classify and detect malware.
Bandizip - Bandizip : All-In-One Free Zip Archiver. Bandizip is a lightweight, fast and free All-In-One Zip Archiver.
dirtyJOE - dirtyJOE - Java Overall Editor - homepage of binary java class file editor
The Unarchiver - Get the top application for archives on Mac. It's a RAR extractor, it allows you to unzip files, and works with dozens of other formats.