Software & Keys
a robust fully featured Windows command line file compression archiver (now rarely used
7-Zip an open architecture, high compression archiver supporting
strong AES-256 encryption and HUGE files
interpreted, interactive, object-oriented, extensible programming language which
runs on Windows, Linux/Unix and Mac OS X)
Security & Crypto
GnuPG (GNU Privacy Guard) is a complete and free implementation of
the OpenPGP standard.
Here are installers for windows (Gpg4win),
OSX (GPGtools) and linux (GnuPG
(Pretty Good Privacy) is a paid version from Symantec
PGP public key
Encryption Wizard (public version) runs in java without install on Windows,
Mac & Linux
True Crypt Free open-source disk encryption software for Windows 7/Vista/XP,
Mac OS X, and Linux.
True Crypt can also be used
to fill disks with random data before reuse or disposal.
viewer (for *.PDF files)
Foxit a viewer for *.PDF files which has less onerous conditions than Adobe
(a Foxit PDF creator is also available)
Replica Viewer (for *.RPL files), Replica is similar to Acrobat & was widely used by 'Engineers on Line'
(IEAust), now rarely used.