PowerArchiver is an archiving tool which crams an array of powerful features into an appealing, easy-to-use interface.
You've no worries about file formats here, for instance, as the program supports just about everything. You get read/ write support for ZIP, ZIPX, 7-ZIP, CAB, LHA (LZH), TAR, GZIP, BZIP2, ISO (ISO9660 and UDF – PRO only), BH, XXE, UUE, yENC, and MIME (Base 64), and read/ extract support for RAR, ARJ, ARC, ACE, MSI, NSIS, CHM, DMG, RPM, CPIO, VHD, XAR, LZMA, SquashFS, CramFS, ZOO, WIM plus ISO (ISO9660 and UDF) disc image formats.
PowerArchiver offers exceptional security, too. As well as fully supporting the standard ZIP AES encryption standard (128/ 192/ 256-bit), its own PAE standard supports encryption with five different methods: Blowfish (128-bit), DES (64-bit), Triple DES (128-bit), AES 128-bit, and AES 256-bit. The program even has FIPS 140.2 Certification for extra reassurance.
If you're more concerned about the program's practical benefits, there are plenty. It's extremely fast, for instance. VSS and UAC elevation support mean it can cope with problems where other tools fail, compressing files even if they're in use and need administrator access to read. and there are tools to repair archives, convert them between formats, create self-extracting archives and a whole lot more.
PowerArchiver 2015 is here and is a major update. See the "what's new" page for more info.