GNU software is the most widely used/ported and best supported freeware in the world. GNU software has mirror sites in many countries to make source code retrieval easier. GNU is responsible for such popular software packages as emacs, gcc, gdb, and various system binary replacements like gawk and df.

The Internet Software Consortium is now home of widely used software packages like BIND, INN, and DHCP. The ISC is now a non-profit corporation who plans on bringing things such as commercial support and software. Their funding base includes the sale of software support and specific enhancement contracts as well as the request of donations.

Sendmail.org is home of Eric Allman's sendmail software as well as the FAQ, links to the sendmail mailing lists and news groups, and spam control measures for versions V8 and above. Ftp.sendmail.org is also hosted by the ISC.

RT, the Request Tracker, is a robust, open-source ticketing system that supports efficient, agile workflow by tracking projects, issues and requests, from inception to resolution, in a community of users.

Apache is arguably the most popular UNIX web server today. Apache rivals (and probably surpasses) almost any other UNIX based HTTP server in terms of functionality, efficiency and speed. Take a look at the web server feature chart to see how Apache ranks among the competition.

SAMBA is an open source software suite that provides seamless file and print services to SMB/CIFS clients. Samba is freely available under the GNU General Public License.

Expect is a tool for automating interactive applications such as telnet, ftp, passwd, fsck, rlogin, tip, and others. By adding Tk, one can also wrap interactive applications in X11 GUIs. This site includes links to the O'Reilly book, the FAQ, an archive of example code, the expect, tcl, and tk source code, and links to other related information.

The perl home page is the definitive perl page and includes the latest software release as well as links to the FAQs, perl support, perl training, perl mailing lists, and the perl journal.

The Catalog of Free Compilers and Interpreters lists freely available software for language tools, which includes the following: compilers, compiler generators, interpreters, translators, important libraries, assemblers, etc. -- things whose user interface is a language. Natural language processing tools may also be included. The list is primarily aimed at developers rather than researchers, and consists mainly of citations for production quality systems.

The Free Database List, maintained by David Muir Sharnoff <muir@idiom.com>, is an attempt to enumerate all known free databases.

TeX is the UNIX typesetting program. This site includes the packages dvips, bibtex, mf, tex, texmf, the web2c distribution, and several sets of fonts. This site also contains precompiled versions for Linux using gcc 2.2.2.

Idled is a program that will run in the background on a machine and monitor the current tty sessions. It can be configured to log out users that have been idle for too long or logged on for too long. It can also prevent users from being logged in too many times, and refuse users from being logged in at all. For those people familiar with VMS, this is something like a HITMAN replacement.

The mtools software package allows on to access a floppy drive local to a UNIX machine with MS DOS style commands and then use that floppy in an MS DOS based machine. For more details, also check the mtools manual information.

Macutils allow one to translate MAC files to UNIX format and visa versa. This software package includes hexbin, binhex, macstream, macunpack, macsave, tomac and frommac.

Jumbo is a large site of software that breaks down its site by the following categories: Business and Financial, Desktop Publishing, Entertainment, Education and Science, Internet and Web, and Utilities. One can also upload one's favorite software to the Jumbo site. Most of the software here seems to be geared towards non-UNIX machines, but they do have a Linux section.

Prime Time Freeware is a site devoted to the development, dissemination, and use of free software. Prime Time Freeware publishes mixed-media (book/CD-ROM) collections of freely redistributable software.

Solaris tools, from www.squirrel.com, is a collection of utilities and links for sun information and tools such as hostid manipulation scripts, unstrip, VIF, ICMP redirect software, and more.

sunfreeware.com is a shareware site of pre-compiled Solaris 2.x and Solaris 7 software, including system administration utilities and development tools.

The Solaris x86 binary archive has a selection of binaries compiled for Solaris x86 2.5 and 2.5.1. Packages are not in pkgadd format, but in tar archives.

Bnl.gov's precompiled software site contains precompiled binaries of various GNU and other freeware utilities for AIX, HP/UX, IRIX, Digital Unix, SunOS, and Solaris (sparc and x86).

Sun's Opcom site in Canada includes binaries for Solaris 2.x, RFCs, ported PD source and precompiled binaries in Solaris pkgadd format, GNU tools, X11R5, and various other packages.

Solaris 2.5 Freeware For SPARC has precompiled binaries of GNU utilities and other various freeware for the SPARC platform, version 2.5 and 2.5.1 of the Solaris operating system. Everything is in a pkgadd ready state to make it easy for novice administrators.

ibiblio's Linux archive has over 2 gigabytes of Linux programs and documentation available for FTP and WWW access including precompiled binaries and source code.

Walnut Creek presses CDs for both Linux and FreeBSD. They are the definitive source for RedHat, Slackware, and MkLinux for the MAC. Walnut Creek also produces various other compilation CDROMs of UNIX source code including binaries for more popular platforms.

Download SMIT-installable precompiled packages of popular freeware for AIX 4.x. These are auto-uncompressing files, just like on PCs (it uses similar technology to PKZIP). Mark the file as executable (chmod +x), then execute it to generate a .bff file. The .bff file can then be installed using "smit install_latest".

The Software & Porting Archive for HP-UX contains both source code and precompiled binaries for HP/UX.

The Linux Applications and Utilities Page is a listing of Linux open source, commercial, shareware and freeware applications, utility programs, development tools and servers having their own web pages. All of the programs listed here have either a Linux native binary available, or source code available which has been successfully compiled to run under Linux. These programs are all currently available for use, though some may still be beta, or even alpha, releases.