B1FreeArchiver 1.5.86 for Mac could be downloaded from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. This free software for Mac OS X is an intellectual property of Catalina Group Ltd. The program lies within System Tools, more precisely File Compression. Please check the Mac app with an antivirus before launch as it is downloaded from the developer's website, and we cannot ensure that it is safe.
From the developer:
B1 Archiver is 100% free archive manager. You can use it on any computer and you don't have to register or pay anything. Feel free to share B1 Archiver with your friends or co-workers. Supports most popular formats - b1, zip, jar, xpi, rar, 7z, arj, bz2, cab, deb, gzip, tgz, iso, lzh, lha, lzma, rpm, tar, xar, z, dmg and others. Works with split and password-protected archives, serves perfectly as a file manager.
You may want to check out more Mac applications, such as NoLimits Pack Extractor, CocoAL or Split n Join Demo, which might be similar to B1FreeArchiver.