- Jester Spite DemoGame
- JetAudio Basic
- Jetcast
- Jetmailmonitor
- Jettoolbar
- Jetvideo
- JetVideo
- JPG to PDF Converter
- Juce
- JuK
- JuniorWatch
- K Desktop Environment 1
- K-Lite Mega Codec Pack
- K3b
- K7 Total Security
- Karaoke 5
- Kaspersky Anti-Virus
- Kaspersky Enterprise Space Security
- Kaspersky Hosted Email Security
- Kaspersky Hosted Web Security
- Kaspersky Internet Security
- Kaspersky Mobile Security
- Kaspersky ONE
- Kaspersky Password Manager
- Kaspersky PURE
- Kaspersky Small Office Security
- Kaspersky Tablet Security
- Kaspersky Total Space Security
- Kaspersky Update Utility
- Kaspersky Work Space Security
- Kate
- Kate (text editor)
- KDE Calligra Words
- Kdenlive
- Keyboard Launchpad
- Keynote
- Keynote
- KeyScrambler Personal
- KGet
- Kingsoft Office 2012
- Kingsoft PC Doctor
- KMail
- KMPlayer
- KOffice is a free open source office suite which is available for Windows, Linux, FreeBSD, and Mac O
- Komodo Edit
- Konqueror
- Konqueror
- Konversation
- Kopete
- Krify Software Technologies (P) Ltd.
- Ksnipe Software Submitter
- Ksnipe Submitter
- Kundli for Windows
- Kword
- LAN Speed Test
- Light Downloader
- LightLogger Keylogger
- Lightning
- LightWave 3D
- Lisa Office System
- Locality
- LockItTight
- LocoScript
- Logic Pro
- Logical Disk Manager
- LogMeIn Free
- LogMeIn Hamachi
- LogonStudio
- Lotus 1-2-3
- Lotus 1-2-3
- Lotus Domino
- Lotus Freelance Graphics
- Lotus Improv
- Lotus Jazz
- Lotus Manuscript
- Lotus Notes
- Lotus Organizer
- Lotus Symphony
- Lotus Word Pro
- Lotus Word Pro
- Lucas Arts Full Throttle
- Lucas Arts Jedi Knight
- Lucas Arts Xwing vs. Tie Fighter
- LynxOS
- Mac OS 8
- Mac OS 9
- Mac OS X Leopard
- Mac OS X Panther
- Mac OS X v10.0
- Mac OS X v10.1
- Mac OS X v10.2
- Mac OS X v10.4 Tiger
- MacDraw
- Macintosh Application Environment
- MacJournal
- MacPaint
- Macrium Reflect Free
- Macromedia Authorware
- Macromedia FreeHand