For distros that use debs:
There are i386 and x86_64 .debs here for debian squeeze and wheezy, and ubuntu precise, quantal, raring, saucy and trusty.
See http://www.4pane.co.uk/Installing.htm for help with installing.
Alternatively there is a repository available: see http://www.4pane.co.uk/Download.htm
There are 1.0 and earlier debs still available in the same repository, for debian etch and lenny; ubuntu intrepid to oneiric; and mepis dapper to lenny.
These and earlier ubuntus are also available from the 1.0 and earlier links and repositories. See http://www.4pane.co.uk/1.0/Download.htm
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For distros that use rpms:
There are binary rpms here for:
i386 and x86_64: SUSE 12.3 13.1, Fedora 19 20, OpenMandriva 2013.0 and 2014.0, and Mageia 4.
There are src.rpms and debuginfo rpms available at http://www.4pane.co.uk/Download.htm.
As 4Pane is now in the official PCLinuxOS repository, I'm no longer providing unofficial packages.
See http://www.4pane.co.uk/Installing.htm for help with installing.
If you use an older version of these distros, there are 4Pane 1.0 rpms available via http://www.4pane.co.uk/1.0/Download.htm
SUSE: 12.1 12.2
Fedora: 16 17 18
Mandriva: 2011.0 and 2013.0
Mageia 2 and 3
PCLinuxOS: 2012.2
If you use a yet older version, there may be rpms for 0.8.0 or earlier; see http://www.4pane.co.uk/Archives.htm
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For other distros:
Slackware:
Here there are slackware 14.1 binary packages. Additionally there is a source package and digital signatures at http://www.4pane.co.uk/Download.htm
See http://www.4pane.co.uk/Installing.htm for help with installing.
For 13.37 and earlier, see http://www.4pane.co.uk/Archives.htm for packages from previous 4Pane releases.
Zenwalk:
The ancient 4Pane 0.5.1 is available from your repositories, but there are 2.0 packages suitable for zenwalk 7.2 at http://www.4pane.co.uk/Download.htm
Gentoo and Sabayon:
See http://www.4pane.co.uk/Download.htm for an overlay and ebuild.
Puppy:
This needs a wxWidgets version that is not currently available from your normal sources.
You can find the appropriate packages from http://www.4pane.co.uk/Download.htm, together with a 4Pane .pet that works with recent Puppy breeds and releases.