DLL Manufacturers
- ProLing ltd.
- Promise Technology INC
- PROMT Ltd.
- Propellerhead Software
- Prosoniq Products Software GmbH
- Protection Technology
- Protexis Inc.
- protobufnet
- Providence Software Solutions Inc.
- Proxima Software
- PSafe Tecnologia S.A.
- PSIClient
- PSPaudioware.com
- Pulse Entertainment, Inc.
- Pure Motion
- PWRD
- Python Software Foundation
- PythonLabs at Zope Corporation
- Q-Team Dr. Knabe GmbH, Korschenbroich, Germany
- qip.ru
- QLogic Corporation
- QSound Labs, Inc.
- Quadrant International, Inc.
- QUALCOMM Inc.
- Qualcomm Atheros
- Qualcomm Atheros, Inc.
- Qualcomm Atheros Communication, Inc.
- Quark, Inc.
- R-TT
- RAD Game Tools Inc.
- Radical Entertainment
- Radius Inc.
- RadLight, Inc.
- Rafael & ZoRoNaX
- Rage Software Inc
- Raidcall
- RAIDCALL
- Rainbow Technologies, Inc.
- Ralink Technology, Inc.
- Rapidsolution Software GmbH
- Raptor Systems Division of Symantec Corporation
- Rational Software
- Raxco Software, Inc.
- Ray Hinchliffe
- Razer USA Ltd.
- Real Networks Inc
- RealAudio Advanced Audio Coding
- Reality Fusion
- Realmforge Studios GmbH, Gaming Minds GmbH
- RealNetworks Inc.
- Realtek provider
- Realtek Semiconductor Corp.
- RealVideo
- RealVNC Ltd.
- Red Bend Ltd.
- Red Hat
- RedBaron Software Company & RJ Designs
- Redcl0ud
- IncrediMail Ltd.
- Redllar's Software
- Reference Implementation
- reFX
- RELAX NG SourceForge Project
- Release Software Corporation
- Relic Entertainment Inc.
- Renaissance Computing
- Renesas Electronics Corporation
- ReputationShield
- Resounding Technology, Inc.
- RESTOOLS
- restsharp.org
- Retro Software Designs
- Revertex Labs.
- RF1911
- Rhozet Corporation
- RichFX Inc.
- Ricoh Co., Ltd.
- RICOH COMPANY, LTD.
- RightNow Technologies Inc.
- RigiSystems AG
- Rimage Corporation
- Ringdale Ltd
- RioPort
- RIOS Systems
- Ritlabs S.R.L.
- Rival Theory Inc
- RK Computer Consulting
- Robert Galle
- Robert Schlabbach
- Rocket Division Software
- RocketLife
- Rocko
- Rocksteady Studios Ltd
- Rockwell Semiconductor Systems
- Rogue Wave Software
- Rohrbacher Development
- Roland Corporation
- Roman Scherbakov
- Rop Papen Concrete FX
- Roth Consulting