
Astrolog is an astrology software program that has been available online free of charge since 1991. It was originally authored by Walter Pullen, and distributed via postings to the Usenet newsgroup alt.astrology.

Cinema 4D is a 3D software suite developed by the German company Maxon.

The Electronic AppWrapper (EAW) was an early commercial electronic software distribution catalog.

Final Draft is a screenwriting software for writing and formatting screenplays.

Game-Maker is an MS-DOS-based suite of game design tools, accompanied by demonstration games, produced between 1991 and 1995 by the Amherst, New Hampshire based Recreational Software Designs and sold through direct mail in the US by KD Software. Game-Maker also was sold under various names by licensed distributors in the UK, Korea, and other territories including Captain GameMaker and Create Your Own Games With GameMaker!. Game-Maker is notable as one of the first complete game design packages for DOS-based PCs, for its fully mouse-driven graphical interface, and for its early support for VGA graphics, Sound Blaster sound, and full-screen four-way scrolling.

The Line Mode Browser is the second web browser ever created. The browser was the first demonstrated to be portable to several different operating systems. Operated from a simple command-line interface, it could be widely used on many computers and computer terminals throughout the Internet. The browser was developed starting in 1990, and then supported by the World Wide Web Consortium (W3C) as an example and test application for the libwww library.

Linux is a family of open-source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991, by Linus Torvalds. Linux is typically packaged in a Linux distribution.

A micro gallery was a computer-based guide to archives and museum collections, first developed for the collections at the National Gallery in London, UK. It took three years to develop by the company Cognitive Applications, and opened in July 1991 as part of the facilities in the Sainsbury Wing. Visitors could use the system to determine which pictures they would like to see in the gallery. It was possible to print out personalised information for use during the visit. The Micro Gallery ran for 14 years and a CD-ROM with similar facilities was produced.

Modedit was a MOD file editor for MS-DOS written by Norman Lin and distributed as Shareware in 1991 and 1992. It was one of the first MOD software available for the PC. Its ability to play MODs through the PC speaker without requiring additional sound hardware, was achieved by using code written by Mark J. Cox.

MS-DOS Editor, commonly just called edit or edit.com, is a character-based text editor that comes with MS-DOS and 32-bit versions of Microsoft Windows. It superseded edlin, the standard editor in earlier versions.

NcFTP is an FTP client program which debuted in 1990 as the first alternative FTP client. It was created as an alternative to the standard UNIX ftp program, and offers a number of additional features and greater ease of use.

Norton AntiVirus is an anti-virus or anti-malware software product, developed and distributed by NortonLifeLock since 1991 as part of its Norton family of computer security products. It uses signatures and heuristics to identify viruses. Other features included in it are e-mail spam filtering and phishing protection.

QBasic is an integrated development environment (IDE) and interpreter for a variety of dialects of BASIC which are based on QuickBASIC. Code entered into the IDE is compiled to an intermediate representation (IR), and this IR is immediately interpreted on demand within the IDE.

QuickTime is an extensible multimedia framework developed by Apple Inc., capable of handling various formats of digital video, picture, sound, panoramic images, and interactivity. First made in 1991, the latest Mac version, QuickTime X, is currently available on Mac OS X Snow Leopard and newer. Apple ceased support for the Windows version of QuickTime in 2016, and ceased support for QuickTime 7 on macOS in 2018.

System 7, codenamed "Big Bang", and also known as Mac OS 7, is a graphical user interface-based operating system for Macintosh computers and is part of the classic Mac OS series of operating systems. It was introduced on May 13, 1991, by Apple Computer, Inc. It succeeded System 6, and was the main Macintosh operating system until it was succeeded by Mac OS 8 in 1997. Features added with the System 7 release included virtual memory, personal file sharing, QuickTime, QuickDraw 3D, and an improved user interface.

Vim is a clone, with additions, of Bill Joy's vi text editor program for Unix. Vim's author, Bram Moolenaar, based it on the source code for a port of the Stevie editor to the Amiga and released a version to the public in 1991. Vim is designed for use both from a command-line interface and as a standalone application in a graphical user interface. Vim is free and open-source software and is released under a license that includes some charityware clauses, encouraging users who enjoy the software to consider donating to children in Uganda. The license is compatible with the GNU General Public License through a special clause allowing distribution of modified copies "under the GNU GPL version 2 or any later version".

ViolaWWW is a discontinued browser, the first to be popular for the World Wide Web (WWW). It was first released in 1991/1992 for Unix and acted as the recommended browser at CERN, where the WWW was invented, but eventually lost its position as most frequently used browser to Mosaic.

Windows Media Player (WMP) is a media player and media library application developed by Microsoft that is used for playing audio, video and viewing images on personal computers running the Microsoft Windows operating system, as well as on Pocket PC and Windows Mobile-based devices. Editions of Windows Media Player were also released for classic Mac OS, Mac OS X and Solaris but development of these has since been discontinued.

WinZip is a trialware file archiver and compressor for Windows, macOS, iOS and Android developed by WinZip Computing. It can create archives in Zip file format, and unpack some other archive file formats.