Lazarus is a free and open source Rapid Application Development
tool for the FreePascal compiler using the Lazarus component
library - LCL. The LCL is included in this package.

PeaZip is a free Zip files utility, providing an unified, natively portable,
cross-platform file and archive manager GUI for many Open Source technologies
like 7-Zip, FreeArc, PAQ, UPX.

Create: 7Z, ARC, BZ2, GZ, *PAQ, PEA, QUAD/BALZ, TAR, UPX, WIM, XZ, ZIP files

Extract 150+ archive types: ACE, ARJ, CAB, DMG, ISO, LHA, RAR, UDF, ZIPX and more

Features of PeaZip includes extract, create and convert multiple archives at once,
create self-extracting archives, split/join files, strong encryption with two factor authentication,
encrypted password manager, secure deletion, find duplicate files, calculate hashes,
export job definition as script.

You can find Linux software packages here, which are featured on the PragmaticLinux blog.