PascalGUI is a GUI/small-IDE for freepascal compiler. PascalGUI supports devices with ARM, x86 and MIPS processors (MIPS doesn't support graph at the moment).
You can write your own applications on the Android phone, and run them. This app uses Freepascal compiler, so it is full-featured. PascalGUI can be used for educational purposes or to practice in Pascal language.
Some binaries used by PascalGUI are GPL-licensed, you can download used source code of Freepascal on Freepascal SVN.

(If you think that there is GPL violation in PascalGUI, email me at n0n3m4@gmail.com. I'll provide to you source code from Freepascal SVN, if you can't download it yourself)

PascalGUI includes Android Terminal Emulator so you can to run your application as good as you running it on your Linux PC.

Quick manual:
If you have found a bug or app is not working, email me.
You can export result of compilation (APK or binary), long-click compile button for that.
Long click save button to "save as", long click run to run with arguments…

C4droid is the most powerful C/C++ IDE + C/C++ compiler for Android.

Features:
• Offline C/C++ compiler: create your own applications on Android device and run them even without Internet access
• Qt, SDL, SDL2, Allegro, SFML, FLTK and NativeActivity support for graphics
• Export & share your programs as APK or binaries
• Debugger with breakpoints and watches
• CMake and Makefile support: use the same build scripts as on your PC (BusyBox is included)
• Source code editor with syntax highlighting, tabs, code completion, code formatting, file association and undo/redo
• No root required (but C4droid can use it for your programs if you want)
• Full ANSI C and ISO C99 support with TCC (Tiny C Compiler) + musl libc
• Fully-functional C++ compiler, complete C++11 support with GCC
• Git integration
• Customizable GUI, choose where to place tabs and buttons by yourself, themes are also supported
• Semi-automatic open-source library porting feature for enhanced programming & education

C4droid is designed to be user-friendy…