Norton Personal Firewall is a software product that helps protect computers against threats from the Internet at the TCP/IP protocol level.

Norton SystemWorks was a utility software suite by Symantec Corp. It integrates three of Symantec's most popular products – Norton Utilities, Norton CrashGuard and Norton AntiVirus – into one program designed to simplify solving common PC issues. Backup software was added later to high-end editions. SystemWorks was innovative in that it combined several applications into an all-in-one software for managing computer health, thus saving significant costs and time often spent on using different unrelated programs.

Norton Textra Writer is an easy to use word processor for IBM PCs and compatibles running DOS. It was based on Ann Arbor Software' Textra, a small and fast word processor highly optimized for speed and rapid data entry, and published by the W W Norton & Co Inc publishing company (no relation to Peter Norton Computing or Symanetc).

The Norton Utilities is a suite of disk and system utilities designed to enhance system performance and stability. It started off as a set of disk utilities written by Peter Norton, and later was sold by Symantec. It competed against Central Point PC Tools and the Mace Utilities. In 2003, Norton Utilities was merged with Norton SystemWorks, but later split back out.

First released in 1982 and based on XyWrite, Nota Bene is a word processor specifically tailored to academic use. It is a very complex, unfriendly, program, but it is packed full of features. Features include footnotes, endnotes, redlining, styles, outlining, tables, indexes, bibliographies, a text retrieval system, foreign language support, spell checker, thesaurus, and a built in programming language. The Ibid component was an option that acted as sort of a database of bibliographic references.

First released in 1984, Nutshell was one of the first easy-to-use general purpose databases. It was created by Nashoba Systems and initially distributed by Leading Edge. layout design. It also supports calculated fields and sorting. version through Forethought Inc. as FileMaker. Later, Nashoba was acquired by Claris, where the product eventually became FileMaker Pro. found here: FileMaker History

Tools for converting and running Windows applications in OS/2.

Menu Planner is a rudimentary low cost application that assists users in planning diet meals. It walks users through a series of "wizard" style selections, keeps track of calories and usage, and provides users with a list of possible meal plans.

OfficeWriter, from Office Solutions, Inc and later Software Publishing Corporation, is a word processor that mimics the Wang word processor system. It was targeted at corporations and competed against Multimate, another Wang word processor workalike.

The Official Guide to Netscape Navigator, from Personal Training Systems, is an interactive training tool for teaching new users the ins and outs of using Netscape Navigator to access information on the Internet.

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.

Open Access III 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 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.