Omnipage is an optical character recognition (scanned image) application that can export to a number of document formats. It was often bundled with scanners.

Omnis, from the European based Blyth Software, is an easy to use multiuser relational database for Windows, MacOS, and OS/2. It was the first database ported to Microsoft Windows, which ran on Windows 1.0x.

Omniview 386 was a multitasking application manager for DOS produced by Sunny Hill Software in the late 1980's. Version 4.11 was reviewed in the February 13, 1989 issue of InfoWorld.

Ontrack PowerDesk is a powerful file manager for Windows 9x/NT that includes built in archive management, file searching, and an FTP client.

SPI Open Access is a DOS based integrated office suite that includes a database, word processor, spreadsheet, statistical analysis, graphics, telecommunications and a C style custom application programming language. Open Access was among the early integrated office suites. Its primary strength was for network use, as multiple users could open and edit the same documents.

Open Systems Accounting Software is a modular accounting package targeted at large businesses. It featured a high level of flexibility, as the company offered source code access for customization. It was available for DOS, XENIX, and Unix systems.

OPTune is a disk optimizer, file system repair tool, and disk tester. It also includes an tool that can change the low-level format sector interleave on MFM/RLL drives, similar to Spinrite.

Oracle Discoverer is an ad-hock reporting tool used with Oracle databases. It can view and edit data and produce reports and graphs.

Oracle Forms and Reports is a GUI application builder. It is similar to Visual Basic, but uses the PL/SQL language and integrates heavily with Oracle Server databases.

Oracle Office 2.0 is a groupware solution from Oracle, similar to Lotus Notes or WordPerfect Office (Groupware), but uses Oracle's database as a backend and includes database functionality in addition to document processing. It featured the ability to connect thousands of users at once. This software later became "Oracle Documents".

Oracle Server is an enterprise grade relational database used in many corporations. It was mainly targeted at high end server operating systems, such as IBM AIX, Sun Solaris, HP UX, Digital VMS, Linux, and Microsoft Windows NT. Oracle makes current versions of their software avaialble for download, but older versions usually disappear.

Orthodontic Computer Software Patient Information Management System is a custom business program specifically designed to aid in the management of orthodontic practices.

Outside In, from Systems Compatibility Corp, is a TSR file viewer that can copy and paste blocks of text from documents in to DOS applications.

Released in 1984 by Business & Professional Software, Inc, Overhead Express is a very early presentation program for the IBM PC that features high quality type, and an on screen print preview. It is geared towards overhead presentations, but can also be used for flyers, newsletters, report cover, labels, and more.

Packard Bell Navigator is an alternate user interface that replaces the Windows 3.1 Program Manager shell. It presents the content of your computer as a series of rooms.

Aldus PageMaker, later Adobe PageMaker, is a desktop publishing program for Mac and Windows. First released in 1985, PageMaker was the first desktop publishing program for the Macintosh. It was followed over a year later with the release of 1.0 for the IBM PC. The PC version was a notable application as it was one of the few rare applications which would run under Windows 1.x. PC PageMaker 1.0 bundled a runtime version of Windows. This enabled MS-DOS users who had not decided to buy Windows to run PageMaker. Aldus skipped version 2.0 on the PC to bring version number in sync with the 3.0 Mac product.

Pageview is a tool to graphically display, manipulate, and print Microsoft Word 3.0 and 4.0 for DOS documents. This was released almost two years prior to Word 1.0 for Windows.

JASC Paint Shop Pro is a simple and easy to use bit-mapped graphics editor. It supports a wide variety of file formats, and photo manipulation functions that were comparable to PhotoShop. It has good support for editing 256 color palletized images that made it ideal for editing web graphics. It was first released in 1990 for Windows 3.0 as just "Paint Shop", and early versions gained popularity through the distribution of shareware releases. It lost popularity in 2003 when 8.0 was introduced with a redesigned UI and in 2004, JASC was acquired by Corel.

Logetech's PaintShow Plus is a DOS based bit-mapped drawing program bundled with Logitech mice. Like ZSoft PC Paintbrush, Microsoft PC Paintbrush, and Mouse Systems PC Paint, PaintShow Plus clones the MacPaint user interface.

Palindrome Network Archivist is an enterprise server program to back up Novell NetWare servers onto tape drives.

PaperPort is a document management system frequently bundled with scanners. It can OCR scanned documents and convert them to PDF.

Parsons Atomic Clock is a fancy utility for synchronizing your computers clock with a time server, either via modem or to an internet time server. Features include an audio spoken clock, time drift estimates, daytime map, lunar phase events, and customizable time counters.

MoneyPlans consists of a series of financial calculations intended to assist you in planning your personal financial situation. This includes calculations for Life Insurance, Disability Insurance, Education, Retirement, Cash Vs Loan, Leas Vs. Loan, Adjustable Rate Loan, Loan Comparison, CD Comparison, Bond Volatility, and Discount Feasibility.

Partition Commander is a Wizard based partition and disk utilization tool. It supports FAT, FAT32, NTFS, HPFS, and some Unix file systems.
It runs in real-mode DOS and installs from only two floppy disks. It competed directly against Partition Magic. Memory Commander, a 386 Expanded/Extended Memory Manager.

Partition-It, from Quarterdeck, is a partitioning tool that features a native Windows 95 32-bit application. It was later acquired by Symantec. Partition-It competed against Partition Magic.