Prodigy was an online service that offered on-line news, forums, stock information, games, banking, online shopping, and e-mail. Its primary feature was that it used a fully graphical user interface, however it was limited to very low resolutions and slow dial-up speeds, making it impractical for displaying photographs or detailed graphical documents.

Professional Write, from Software Publishing Corporation, was a popular word processor for home use during the late 80s and early 90s. It features an easy to use menu system and an integrated spell checker. Professional Write was a revamp and replacement for SPC's earlier PFS:Write.

Professor DOS, from INDIVIDUAL Software, is a friendly interactive training guide that helps you learn how to use DOS on your IBM PC or compatible computer.

Professor WINDOWS, from INDIVIDUAL Software Incorporated, was a best selling Training program for and about Microsoft Windows 3.0. There was also a "Professor DOS"

Project Manager Workbench, later just called Project Workbench, is a powerful, full featured, professional project management program for DOS. At the time, it was also very pricey.

Prokey is a DOS TSR macro recording and playback program. It adds lotus-style menus to applications, lets users create their own help messages, can copy text from the screen, remembers the last 300 keystrokes, and supports timed reminder alerts.

Protec is a DOS menu shell that restricts access of files and programs to specific users. It hides files so they can not be easily seen by unauthorized users, includes encryption tools, and features access audit logging.

Proteus Design Suite is a circuit design and simulation program.

PsiWin, from Psion PLC, is a tool for managing, interfacing with, and backing up PSION Personal Digital Assistants. It supports converting file formats such as Microsoft Word, Microsoft Excel, Borland dBase, Quattro Pro, WordPerfect, and Lotus Smartsuite. It also contains a Windows version of the Psion Database software.

Publish Pac is a set of drivers and a small scanning application for use with DEST scanners. It does not do much without the scanner, but it is interesting as it runs under Microsoft Windows 1. It includes a Windows 1.04 runtime, so DOS users would not have to purchase Windows.

Publish-It! is a WYSIWYG desktop publishing tool originally created by the UK based GST Software for the TOS/GEM Atari ST system. There were versions for IBM PC/GEM, Apple II, Macintosh (as "Publish-It! Easy"), and later Microsoft Windows. desktop publishing tools, it is not a full word processor, but rather imports text and focuses on high-quality formatting and printing. budget title for home users. SoftKey also released a version branded as Key Publisher

Publisher's Paintbrush is the premium version of ZSoft PC Paintbrush. It includes enhanced features targeted at desktop publishers. Features include enhanced fonts and zooming.

Publisher's TypeFoundry is a set of tools for creating and editing fonts. It includes an Outline Editor for use with vectored fonts, and a Bitmap Editor for use with bit-mapped fonts. It includes a copy of ZSoft PC Paintbrush for Windows so that fonts may be imported to or exported from a variety of sources. Its import/export tools can translate between HP LaserJet, GEM/Ventura Publisher, Windows/PageMaker, and PostScript fonts.

BatchWorks is an automation tool for Windows that enables you to record macros and control Windows application. You can record macros to a file, edit them, and add programmatic control. It features the ability to add custom dialogs, a C style scripting language editable in any text editor, and interactive debugging.

The PubTech File Organizer is an alternate desktop shell for Windows that attempts to mimic the Macintosh Finder. It features drive icons directly on the desktop, a Garbage icon, and folders that open in new cascaded windows with icons representing files. Applications are easily accessible from an "Applications" menu. Files and programs may be placed directly on the File Organizer desktop. In many ways, it is similar to the Windows 95 desktop, but the earlier versions work under Windows 2!

PushButton WORKS, from MicroBurst Inc., was a very low cost rudimentary integrated office suite. It includes a word processor, spread sheet, graphing program, and database. It competed with ClarisWorks, Footprint Works, and Microsoft Works for Windows.

PuTTY is a free and open-source terminal emulator, serial console and network file transfer application.

Pyro, from Fifth Generation Systems, is a commercial set of screen savers that started of as a simple black and white fireworks screen saver on the Apple Macintosh. It competed against AfterDark.

Symantec Q&A is a low end flat-file database manager that includes a word processor and a natural language query and reporting interface. While the package is forms-based like Professional File, it is more sophisticated and powerful. Symantec also sold a companion word processor called Q&A Write.

Q&A Write is a word processor designed to accompany Symantec's Q&A database software product. Q&A Write is designed to resemble PFS:Write, and excelled in the areas of ease of use and laser printer support. It also includes mail-merge, keyboard macros, math calculations, envelope printing, spell-checking, and a Lotus 1-2-3 interface.

Q+E is a database utility designed to edit and manipulate data in large databases using SQL. It supports DBASE, Text files, and SQL Server, and can work with multiple databases at once. There was also an OS/2 version. Later versions support Paradox, IBM DB2, and XLS files. It was sold alongside an application development system called Q+E Database Library

Gazelle Systems Q-DOS is a text mode based file manager for DOS. Q-DOS is a simplified file manager that presents all DOS functions visibly. It competed against many other file managers including Norton Commander and Xtree

QAPlus is an extensive set of tools to test the functionality of a PC, measure performance, and optimize the configuration. It can test motherboard resources, RAM, video cards, I/O ports, and floppy drives. Later versions supported Microsoft Windows. It competed with tools like Checkit and AMI Diagnostics.

SemWare's QEdit is a powerful, highly responsive, and scriptable text-mode editor. It was also distributed as shareware. It competed with programs like Borland Brief.

Quarterdeck QEMM is a DOS Extended Memory Manager for 386+ computer which allows you to make use of memory beyond the 640kb barrier. It can also be used with QRAM, a utility for freeing up the 640k base memory.