Cydia.app

Summary
Cydia is an open source application installer created by Saurik that uses the Debian APT system for package management. It is included with all iPhone Dev Team jailbreaks, and is found in every mainstream jailbreak tool (e.g evasi0n, absinthe, redsn0w, limera1n, blackra1n, PwnageTool, sn0wbreeze, greenpois0n, Spirit, Star) since iOS 2.0. However, some jailbreak tools install lighter apps (such as Loader.app (greenpois0n) or blackra1n.app (blackra1n and limera1n)) to download and install Cydia directly on the device, instead of having it installed at the same time as jailbreaking, making for a lighter download and jailbreak.

Latest Version
The latest on saurik's repo is 1.1.6 because 1.1.8 does not support iOS 3.x.
 * 1.1.8 for iPad, iPad 2, iPad 3, iPad 4, iPad mini 1G, iPhone 3GS, iPhone 4, iPhone 4S, iPhone 5, iPod touch 3G, iPod touch 4G, iPod touch 5G
 * 1.1.6 for iPod touch 2G
 * 1.1.3 for iPhone, iPhone 3G, iPod touch (S5L8900 devices)
 * There is no version for Apple TV.

Installed Packages
With the evasi0n jailbreak, the following packages are installed by default with Cydia:
 * APR (/usr/lib)
 * APT 0.7 (apt-key)
 * APT 0.7 Strict (lib)
 * Base Structure
 * Big Boss Icon Set
 * Bourne-Again SHell
 * bzip2
 * Core Utilities (/bin)
 * evasi0n 6.0-6.1.2 Untether
 * Cydia Installer
 * Cydia Translations
 * Darwin Tools
 * Debian Packager
 * Debian Utilities
 * Diff Utilities
 * Find Utilities
 * GNU Privacy Guard
 * grep
 * gzip
 * LZMA Utils
 * New Curses
 * PAM (Apple)
 * PAM Modules
 * pcre
 * Profile Directory
 * readline
 * sed
 * shell-cmds
 * system-cmds
 * Tape Archive
 * UI Kit Tools