3D FloorPlan is a 3-dimensional architectural and space planning program for small business professionals and home users. The user may design a home addition or remodel in 2D and FloorPlan automatically converts the drawing into 3D. The user can then walk through the 3D model in real time.

3D Studio, not to be confused with the later "3d Studio Max" product, is a DOS-based tool from Autodesk for creating 3d models and animations.

First released in 1983 by IMSI (International Microcomputer Software, Inc), 4 Point Graphics was one of the earliest drawing and animation programs for the IBM PC. It competed against a drawing program called PC Crayon.

4DOS is a command line interpreter replacement for command.com that adds many new features.

4WORD is an add-in word processor for Lotus 1-2-3. Unlike TSR programs 4WORD works from within Lotus, using the same menus, using the Lotus printer drivers, and storing your documents inside your spreadsheet. It can copy and paste data between your document and spreadsheet as well link to live cells in to your document.

Originally released in 1984 by the Canadian company Xanaro that went bankrupt, and then by Migent, Ability is an integrated office suite for DOS that includes word processor, spreadsheet, database, telecommunications, business graphing, presentation graphics capabilities, and built in file management. It features good integration between the different components, with the ability to import, share, and dynamically update data between them. It was advertised as a very easy to use and a quick to learn system.

ABstat, from AndersonBell, is a statistical package that contains a variety of statistical functions, creates graphs, features a command language, and can directly use dBase files.

ACT!, or "Activity Control Technology", originally from Conductor Software, and later Contact Software and then Symantec, is an easy to use business relationship management system targeted at traveling sales professionals. It can track things like billable time and expenses.

Acrobat Reader is the free software from Adobe used to read, view, and print documents created by the commercial Adobe Acrobat product. Its primary strength is that documents appear and print identically across differing systems.

AdvanceLink is a terminal emulator that integrates with the HP NewWave desktop. It has built in scripting tools and features specifically for communicating with HP 3000, HP 9000, and HP 1000 hosts. It can emulate HP 2392A, HP 700/94, HP 700/92, HP ANSI, and DEC VT100 terminals. It appears a lesser version of this product was bundled with early Vectra computers under the generic name of "HP Terminal Program"

After Dark, from Berkeley Systems, Inc, is a set of entertaining screen savers for Mac and Windows. After Dark for Windows started off as "Magic Screen Saver" for Windows 2.x. After Dark was most famous for its "Flying Toasters" screen saver. Afterdark was very popular on both the early Macintosh computers and Windows 3.0, as neither included any kind of screen saver or screen blanker that would help prevent screen burn-in.

Allways is a lotus 1-2-3 add-in that enhances 1-2-3 by providing a graphical preview, graphs and spreadsheets on the same printed page, embedded graphic pictures, font formatting for individual cells, and enhanced cell formatting. It supports HP and PostScript laser printers.

America Online was a proprietary dial-up online service that eventually grew to offerer Internet access. In the mid 1990s AOL was very heavily promoted. Every month or two, you were sure to get a free AOL floppy disk or CD-ROM in the mail. AOL originated as PC-Link.

Houghton Mifflin American Heritage Electronic Dictionary is a resident background program that gives you instant searchable access to an entire dictionary.

AnyTime, from Individual Software, is a personal information manager that helps you keep track of day-to-day appointments, events, and to-do items. You can keep a list of family, friends, and business contacts using the Address Book.

Originally called Draw Applause, Applause is a slide making, charting, and presentation program for DOS from Ashton-Tate. It also served as a client front end to Ashton Tate's Graphics Service, through which one could purchase high-quality prints. Applause II beefs up the standalone desktop presentation and graphing abilities.

Arborist(TM) Decision Tree software, from Texas Instruments/Integral Quality, is a general purpose tool for decision analysis. It features a graphic user interface for decision tree construction, decision tree evaluation, and decision tree analysis. Arborist Decision Tree software is not complicated to use, and it is not restricted to an area of decision problem analysis. Its ease of use makes it convenient and effective to analyze many problems that previously were not cost effective to analyze.

Atline, from Digital Research, is a vector based illustration program for use in desktop publishing. It is exclusively for the GEM desktop environment. Artline is intended for use alongside the GEM Desktop Publisher.

Aslightly LabelPro is a label printing utility for use in conjunction with Aslightly label products. It supports mail merge, graphics and text, postal bar codes, and includes clipart.

First released in 1989, AutoDesk Animator was a DOS-based professional animation tool. It could create full motion animations using VGA 320*200 256 color resolutions. It supports a number of animation techniques, and includes a freely redistributable animation player. It saves animations to the .FLI or "QuickFlick" format. This format was extremely popular during the very early 90s, and was one of the few that could do 256 colors, including pallet manipulation.

AutoCAD, from Autodesk and first released in 1982, is a powerful Computer Aided Design tool. It was, and still is, often considered the standard for CAD tools. Primarily for the IBM PC platform, it was ported to x86 machines with higher video resolutions such as the Zenith Z-100 and NEC APC. Intermittently, versions for the Macintosh appeared. Later versions use a dongle copy protection.

Autodesk Deck is a stripped down CAD program that contains pre-defined objects specifically for designing deck layouts.

Autodesk Multimedia Explorer was sold as a lesser version of Animator along side Autodesk Animator Pro. It includes the low resolution-only Autodesk Animator 1.0, Autodesk Animation Player for Windows, and sample animations.

Automenu is a sophisticated commercial menuing system that lets you control your computer using custom menus, rather than using DOS commands. It features small, compact memory usage and built in help.

AutoSketch is a 2D vector program sold by Autodesk. Unlike artistic drawing programs, AutoSketch is specifically geared towards engineering applications. Although not as powerful as AutoCAD, it can work with 2D AutoCAD files. Autodesk also produced AutoCAD LT, a higher end 2-D drawing program. But unlike AutoSketch, AutoCAD LT was based directly on AutoCAD and worked similarly.