Below you can find links to download RedSn0w, a tool released by the iPhone Dev-Team to jailbreak the iPhone, iPad, and iPod touch.

RedSn0w 0.9.8b6 (Mac): redsn0w_mac_0.9.8b6.zip
RedSn0w 0.9.8b6 (Windows): redsn0w_win_0.9.8b6.zip
RedSn0w 0.9.8b5 (Mac): redsn0w_mac_0.9.8b5.zip
RedSn0w 0.9.8b5 (Windows): redsn0w_win_0.9.8b5.zip
RedSn0w 0.9.8b4 (Mac): redsn0w_mac_0.9.8b4.zip
RedSn0w 0.9.8b4 (Windows): redsn0w_win_0.9.8b4.zip
RedSn0w 0.9.8b3 (Mac): redsn0w_mac_0.9.8b3.zip
RedSn0w 0.9.8b3 (Windows): redsn0w_win_0.9.8b3.zip
RedSn0w 0.9.8b2 (Mac): redsn0w_mac_0.9.8b2.zip
RedSn0w 0.9.8b2 (Windows): redsn0w_win_0.9.8b2.zip
RedSn0w 0.9.8b1 (Mac): redsn0w_mac_0.9.8b1.zip
RedSn0w 0.9.8b1 (Windows): redsn0w_win_0.9.8b1.zip

RedSn0w 0.9.6rc19 (Mac): redsn0w_mac_0.9.6rc19.zip
RedSn0w 0.9.6rc19 (Windows): redsn0w_win_0.9.6rc19.zip
RedSn0w 0.9.6rc16 (Mac): redsn0w_mac_0.9.6rc16.zip
RedSn0w 0.9.6rc16 (Windows): redsn0w_win_0.9.6rc16.zip