(on Wikipedia)
http://rarlab.com/

An archival utility.

I've been using this for a hell of a long time.

• aka WinRAR, for its Windows versions.
• After this, I used 7zip

• Before this, I used zip

• 2016-03-28 - 5.30 beta 6, on Slackware 14.1
• 2016-03-26 - (version not recorded), on Lubuntu 14.04.4 LTS
• I've been using rar for years on various Linux distributions.
• 2016-03-21 - 3.9.3, on Windows 10
• I used this during my brief stint with Windows 8.1
• I used this on Windows Legacy
• 2010-10-01 - 3.93, on Windows XP

• I used this on Windows 98se, Windows 98, Windows 95, Windows 3.1 and DOS.

2016-03-28 - 5.30 beta 6 ∞

I installed this on Slackware 14.1, using slpkg:

\slpkg  -s sbo  unrar

While this gave me unrar-5.3.7-i486-1_SBo.tgz, the program itself (unrar) gives me 5.30 beta 6.

2016-03-26 - (version not recorded) ∞

I installed this on Lubuntu using it's repository.

2016-03-21 - 3.9.3 ∞

On Windows 10..

ClamWin detected Win.Trojan.Ramnit-6879 for wrar393.exe, so I'm updating this in my toolkit.

2010-10-01 - 3.93 ∞

On Windows XP..