AltStore: An Alternative App Store for Non-Jailbroken iOS Devices
AltStore is an open-source iOS app that lets users sideload .ipa files onto non-jailbroken devices using only their Apple ID. It resigns apps with a personal development certificate and installs them via AltServer over iTunes WiFi sync, periodically refreshing apps in the background to prevent expiration. The author is now working on letting third-party developers list and distribute their apps through AltStore.
What this means for indie developers：For indie developers who can't ship on the App Store or want to bypass review, AltStore offers an open-source reference path for sideloading and self-signed distribution.