Redsn0w is a program that is used to jailbreak an iPhone or iPod touch. The jailbreaking process is what allows you to run custom application on your iPhone or iPod.
[Updated for iOS 5.1.1 & iOS 6 - Redsn0w 0.9.15b3 ]

Redsn0w 0.9.15 For Jailbreak iOS 6.0.1 Tethered & Older UNTethered (Mac & Win)
[*]redsn0w_0.9.15b3 [Mac & Win][*]redsn0w_0.9.15b2 [Mac & Win][*]redsn0w_0.9.15b1 [Mac & Win]
Redsn0w 0.9.14 For Jailbreak iOS 6 Beta Tethered & Older UNTethered (Mac & Win)
[*]redsn0w_0.9.14b2 [Mac & Win][*]redsn0w_0.9.14b1 [Mac & Win][*]redsn0w_0.9.13dev4 [Mac & Win][*]redsn0w_0.9.13dev3 [Mac & Win][*]redsn0w_0.9.13dev2 [Mac & Win]
Redsn0w 0.9.12 For Jailbreak iOS 5.1.1 UNTethered (Mac & Win)
[*]redsn0w_0.9.12b2 [Mac & Win][*]redsn0w_0.9.12b1 [Mac & Win][*]redsn0w_0.9.11b4 [Mac & Win]
Redsn0w 0.9.10 For Jailbreak iOS 5.1 Tethered (Mac & Win)
[*]redsn0w_0.9.10b8c [Mac & Win][*]redsn0w_0.9.10b8b [Mac & Win][*]redsn0w_0.9.10b8 [Mac & Win][*]redsn0w_0.9.10b7 [Mac & Win][*]redsn0w_0.9.10b6 [Mac & Win]
Redsn0w 0.9.10 For Jailbreak iOS 5.0.1 UNTethered (Mac & Win)
[*]redsn0w_0.9.10b5 [Mac & Win] –> iBooks Fixed[*]redsn0w_0.9.10b4 [Mac & Win][*]redsn0w_0.9.10b3 [Mac & Win][*]redsn0w_0.9.10b2 [Mac & Win][*]redsn0w_0.9.10b1 [Mac & Win]
Redsn0w 0.9.9 For Jailbreak 4.1 , 4.2.1 , 4.3.0 , 4.3.1 , 4.3.2 , 4.3.3 [Untethered] and 4.3.4 , 4.3.5 & iOS 5 & iOS 5.0.1 Beta [Tethetred] (Mac & Win)
[*]redsn0w_0.9.9b5 [Only Mac OSX][*]redsn0w_0.9.9b6 [Mac & Win][*]redsn0w_0.9.9b7 [Mac & Win][*]redsn0w_0.9.9b7b [Mac & Win][*]redsn0w_0.9.9b7d [Mac & Win]
Redsn0w 0.9.9 For Jailbreak 4.1 , 4.2.1 , 4.3.0 , 4.3.1 , 4.3.2 , 4.3.3 [Untethered] and 4.3.4 , 4.3.5 & iOS 5 Beta [Tethetred] (Mac & Win)
[*]redsn0w_0.9.9b1[*]redsn0w_0.9.9b2[*]redsn0w_0.9.9b3[*]redsn0w_0.9.9b4
Redsn0w 0.9.8 For Jailbreak iOS 5.0 beta7 & iOS 4.3.5 with 06.15.00 Baseband Tethered (Mac & Win)
[*]redsn0w_0.9.8b7[*]redsn0w_0.9.8b7b[*]redsn0w_0.9.8b7c
Redsn0w 0.9.8 For Jailbreak iOS 5.0 beta6 Tethered (Mac & Win)
[*]redsn0w_0.9.8b6
Redsn0w 0.9.8 For Jailbreak iOS 5.0 beta5 Tethered (Mac & Win)
[*]redsn0w_0.9.8b5
Redsn0w 0.9.8 For Jailbreak iOS 5.0 beta4 & iOS 4.3.5 Tethered (Mac & Win)
[*]redsn0w_0.9.8b4
Redsn0w 0.9.8 For Jailbreak iOS 5.0 beta Tethered (Mac & Win)
[*]redsn0w_0.9.8b1 (JB iOS 5b1)[*]redsn0w_0.9.8b2 (JB iOS 5b2)[*]redsn0w_0.9.8b3 (JB iOS 5b3)
Redsn0w 0.9.6rc For Jailbreak iOS 4.3.3 (Mac & Win)
[*]redsn0w_0.9.6rc15[*]redsn0w_0.9.6rc16[*]redsn0w_0.9.6rc17[*]redsn0w_0.9.6rc18[*]redsn0w_0.9.6rc19
Redsn0w 0.9.6rc For Jailbreak iOS 4.3.2 (Mac & Win)
[*]redsn0w_0.9.6rc13[*]redsn0w_0.9.6rc14
Redsn0w 0.9.6rc For Jailbreak iOS 4.3.1 (Mac & Win)
[*]redsn0w_0.9.6rc9[*]redsn0w_0.9.6rc10[*]redsn0w_0.9.6rc11[*]redsn0w_0.9.6rc12
Redsn0w 0.9.7 For Jailbreak iOS 4.2.1 (Only for Mac OS)
[*]redsn0w_mac_0.9.7b1[*]redsn0w_mac_0.9.7b2[*]redsn0w_mac_0.9.7b3[*]redsn0w_mac_0.9.7b4[*]redsn0w_mac_0.9.7b5[*]redsn0w_mac_0.9.7b6
Redsn0w 0.9.6 For Jailbreak http://....../208898/iOS 4.1 (Mac & Win)
[*]redsn0w_0.9.6b1[*]redsn0w_0.9.6b2[*]redsn0w_0.9.6b3[*]redsn0w_0.9.6b4[*]redsn0w_0.9.6b5[*]redsn0w_0.9.6b6[*]redsn0w_0.9.6rc7[*]redsn0w_0.9.6rc8
Redsn0w 0.9.5 For Jailbreak iOS 4.0 (Mac & Win)
[*]redsn0w_0.9.5b5-1[*]redsn0w_0.9.5b5-2[*]redsn0w_0.9.5b5-3[*]redsn0w_0.9.5b5-4[*]redsn0w_0.9.5b5-5
Redsn0w 0.9.4 For Jailbreak iOS 3.1.3 (Mac & Win)
[*]redsn0w_mac_0.9.4[*]redsn0w_win_0.9.4
Redsn0w 0.9.3 For Jailbreak iOS 3.1.2 (Mac & Win)
[*]redsn0w_mac_0.9.3[*]redsn0w_win_0.9.3
Redsn0w 0.9.2 For Jailbreak iOS 3.1.2 (Mac & Win)
[*]redsn0w_mac_0.9.2[*]redsn0w_win_0.9.2