- USANET
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- Usaver
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- USB 40
- USB Block
- USB Disk Security
- USB flash drive
- USB History
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- USB Lock
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- User Kind
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- User Local
- User Replay
- User Story
- User Studio
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- User10
- User1st
- userADgents
- UserApp (discontinued)
- UserBallot
- Userbin
- UserBob
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- Usercible - UX Consultant
- UserDeck
- USEREADY
- UserEngage
- UseResponse
- UserEvents
- Userfacet
- Userfarm
- UserFix