Top Alternatives to Unclutter

Ditto is an extension to the standard windows clipboard.

RecentX is a launcher for Windows designed to make your computing life joyful.

CopyQ is a clipboard Manager with Advanced Features.

FastKeys is all-in-one Windows automation software. Create personalized Start Menu, Shortcuts, Text Expander phrase strings, etc.

ClipX is a tiny clipboard history manager for Windows. ClipX is fairly easy to use and it is offered free of charge, but it does not offer the clip-management features found in similar applications.

ArsClip is a freeware clipboard manager utility. ArsClip monitors the clipboard and keeps track of the entries.

ClipMenu can manage clipboard history.

CLCL is clipboard caching utility.

Parcellite is a lightweight, tiny and free clipboard manager for Linux with a small memory footprint.

Jumpcut is an application that provides "clipboard buffering", that is, access to text that you've cut or copied, even if you've subsequently cut or copied something else.

Flycut is a clean and simple clipboard manager for developers. It based on open source app called Jumpcut.

ClipIt is a lightweight, fully featured GTK+ clipboard manager.

1Clipboard is a universal clipboard managing app that makes it easy to access your clipboard from anywhere on any device.

Ethervane Echo is a clipboard extender.

ClipboardFusion makes it easy to remove clipboard text formatting, replace clipboard text or run powerful macros on your clipboard contents.

Clipjump is a multiple clipboard management utility for Windows.

Klipper is a clipboard manager for the KDE interface.

ClipMate is a clipboard Manager For Windows.

Paste is a clipboard history management app for Mac.