What are some alternatives?
When comparing Cydia and Cyder, you can also consider the following products
Apple App Store - Install apps on your iDevice via the App Store.
iNoJB - iNoJB, formerly iNoCydia, is an amazing Cydia alternative requiring no jailbreak!
Apps4iPhone - Apps4iPhone is a tool that you use to install apps without the App Store.
Zestia - Zestia is a mobile app designed to assist you in organizing your hectic schedule, social life, and professional persona.
AppCake - AppCake is a website and mobile app that gives you a place to download apps for your iPhone from. The site features all sorts of apps, from games to productivity based apps. Read more about AppCake.
OpenAppMkt.mobi - OpenAppMkt.mobi is an app store for HTML5 mobile apps.