1)   EF Commander 6.62
File manager, easy to use, full customized, tabbed interface, fast FTP client, multirenamer, internal packers, internal viewers, burn on CD/DVD, internal text and HEX editors, synchronize function, SFV, MD5 and SHA1, multilingual, and much more...
EFSoftware, EFCW, Commander, Shell, Tool, Utility, File Manager, Norton, Explorer Replacement, FTP,

 2)   EF Duplicate Files Manager 5.10
EF Duplicate Files Manager could find out duplicate files with same name, same size, same content on specify paths. Handle optional like folders the archive files. Multilingual. Shareware
EFSoftware, EFDFM, Duplicate, Find, Search, 7-Zip, 7ZIP, ACE, ARC, ARJ,

 3)   EF Find 4.71
EF Find is a powerful search program. Look for files, text, HEX sequences and regular expressions inside 7-Zip, ACE, ARC, ARJ, BZIP2, CAB, CPIO, GZIP, IMG, ISO (ISO9660), LHA, RAR, RPM, SFX, SQX, TAR, TBZ, TGZ, ZIP, Zip64, ZOO archives.
EFSoftware, EFFind, Find, Search, Regular expressions, HEX, 7-Zip, 7ZIP, ACE, ARC,

 4)   EF File Catalog 1.73
Catalog whole disks or only single directories with familiar Explorer-like user interface and makes it available for offline browsing and searching. Multilingual.
EFSoftware, EFCat, Catalog, CDDB, 7-Zip, 7ZIP, ACE, ARC, ARJ, BZIP,