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Icy is a package installer/manager for jailbroken iPhone and iPod Touch, originally created and maintained by Ripdev, which allows users to browse and download applications from a range of sources. Most applications are available to download for free, with some requiring purchase after downloading, including other software created by Ripdev, such as Kate. The applications are downloaded directly to iPhone or iPod Touch and are generally located in the
/Applications/ directory, in the same place where "Apple native" applications are located.
Icy by RipDev
Icy was intended as an alternative to Cydia as a source of unofficial applications, since development on Installer.app (created by Nullriver) was discontinued. The purpose of developing Icy was to create a package manager that used APT which is the same method used by Cydia, therefore making Icy compatible with Cydia sources, that was faster and more lightweight than Cydia. 
Icy by WeAmDev
The Icy Project was updated by WeAmDev and is available for download through Cydia. WeAmDev's latest Icy (Version 2.2) brings support for all firmwares going back to 4.x all the way to iOS 5. This version of Icy claims to be more stable than Infini-Dev's Icy and to include more features, such as landscape rotation and online package backups.
Icy by Infini Dev
A group called Infini Dev has also taken up the project of reviving Icy. They claim to have created this version from RipDev's source code and called their Icy version 1.5.1. With the help of @fr0st, Icy 1.4.7 added support to the iPad, but he has long been away from the team and has been active on WeAmDev. The development members are @Samtulp6_ and @iPwnM0nster. The 1.5.1 version is fr0st's final release before he departed from the team. It does not support iOS 5.
- Cydia (application)
- Hardware restrictions#Apple devices
- Rooting (Android OS)
- Advanced Packaging Tool
- iOS Jailbreaking
- "Icy, our lightweight DPKG installer, is now available in source form under MIT license. You're free to do whatever you want with it. It would be nice if someone picks up the project…" - From the Ripdev website
- "Icy is our take on the freeware package manager that uses APT repositories to install and remove packages available in another free iPhone installer application, Cydia. The goal was to create a fast, lightweight and more slick solution that is easy and cool to use. Icy is already at version 1.3, and we're working diligently on more improvements." - From the Ripdev website
- Icy's source code: Icy