Things Apple doesn't let in their curated iOS and OS X stores
Apple's App stores are a mixed bag - it's nice to have someone at least trying to keep the malware and crapware out, but - they restrict some types of apps, which is a bummer. I understand why - but it's still a bummer.
For OS X - it's not a big deal, you don't need to get your software from their App Store. For iOS - until now, if Apple didn't approve, you were out of luck unless you wanted to Jailbreak. Jailbreaking is fun, but can be ugly - it is very unsupported, and can have stability issues. It is not everyone's cup of tea.
Having said that, Apple recently allowed 'sideloading', letting anyone download Xcode and push their own apps to their own devices - without restrictions. You just need to have the source code and compile it yourself. Ok, that works - I can stay on a recent version of the OS, not worry about jailbreaking, and still run what I want.
- GBA4iOS Gameboy Advance Emulator for iOS. Mad props to Riley.
- SOCKS for iPhone SOCKS5 Proxy for iOS
Additions encouraged - send a pull request, or just comment.