- Plextek Limited
- Plextor
- Plexus Com/Group
- Plixer International
- PlotSoft
- Plumtree Software
- Plus Development Corporation
- Plusfactor Solutions Ltd
- Plusnet
- PLUSTECH
- Plustek
- Plustek BookReader V100
- Plustek BookReader V200
- Pluto E100
- Pluto E200 / E205
- PLX Technology
- PMC Software
- PMT Corporate
- Pneuron
- PNMsoft
- PNY
- PocketZip
- Poikosoft
- Point 4 Data Corporation
- Point Alliance
- Point of View
- Point-of-Rental Systems
- PointClickCare
- Pointivity, Inc.
- PointPath, LLC.
- PointSource LLC
- Polar Systems, Inc.
- Polarion Software, Inc.
- Polaris Financial Technology Limited.
- Polistil
- Polistil V.G.2
- PoliticIt
- Polycon
- Polycon 4002
- Polycon 4003
- Polycon C 4016
- Polycon C4010
- Polycon PG-7
- PolyEdit
- PolyMorphic Systems
- PolySoft Solutions
- Polytron Corp.
- Pomeroy IT Solutions, Inc.
- PopCap Games
- Poppy 9009
- Poppy 9012
- Poppy 9015
- Poppy 9017
- Poppy TVG-10
- Poppy TVG-3
- Poppy TVG-4
- Popular Estate Management Ltd
- Popular Mechanics
- Portable Plus
- Portable StyleWriter
- PortableApps
- PortableApps.com
- Portal Software
- Portalarium
- Portfolio
- Portfolio Lightbox
- Portfolio Timeline
- Portico Systems
- Portland Managed Services
- Portrait Display Labs
- Portrait Software
- Portwell Inc
- POS Solutions Limited
- Poser
- Poser
- Poser Debut
- Poser Pro
- PoseWriter Panel
- Posh Technologies Inc.
- Positive Internet
- Post Office Research Station
- Post-it Digital Notes
- Postgresql Community
- Power Computing Corporation
- Power Data Recovery Free Edition
- Power Mac
- Power Mac G4
- Power Mac G4 Cube
- Power Mac G5
- Power Macintosh
- Power Macintosh 4400
- Power Macintosh 5200
- Power Macintosh 5260
- Power Macintosh 5300
- Power Macintosh 5400
- Power Macintosh 5500
- Power Macintosh 6100
- Power Macintosh 6200
- Power Macintosh 6300