Apps (little software applications) allow you to customize your tablet to do the things you like to do. Some of the apps listed are free, while others are fee-based. Additionally, some apps are initially free, and then require in-app purchases if more features and functionality are desired. Listed, you will find some app recommendations that have come up with through trial, error, and experiences.
Kodiak for PHP-Write and edit PHP with beautiful syntax highlighting and an enhanced on-screen keyboard. (iOS)
Pythonista-An integrated development environment for writing Python™ scripts on iOS. You can create interactive experiments and prototypes using multi-touch, animations, and sound, or use the interactive prompt as a calculator. (iOS)