GodMode9 Explorer by d0k3 is a full access file browser for the Nintendo 3DS console. It gives you access to your SD card, to the FAT partitions inside your SysNAND and EmuNAND and to basically anything else. Among other functionality you can copy, delete, rename files and create folders. You can find the source here. Read more about GodMode9 Explorer v1.6.3 (3DS Application)
mGBA is a Game Boy Advance emulator written in C. The project started in April 2013 with the goal of being fast enough to run on lower end hardware than other emulators support, without sacrificing accuracy or portability. Even in the initial version, games generally play without problems. It is loosely based on the previous GBA.js emulator, although very little of GBA.js can still be seen in mGBA. Read more about mGBA v0.6.3 (GBA emu for Nintendo 3DS)
Jayenkai of A Game A Week fame is tweaking his AGameAWeek C++ Framework in a way, that it can compile these games for Nintendo 3DS as well. One of the smaller challenges which are still present are fights with the memory limitation. Read more at GBAtemp. Read more about Jayenkai’s A Game A Week Coming to Nintendo 3DS? (Nintendo 3DS misc)
mGBA is a Game Boy Advance emulator written in C. The project started in April 2013 with the goal of being fast enough to run on lower end hardware than other emulators support, without sacrificing accuracy or portability. Even in the initial version, games generally play without problems. It is loosely based on the previous GBA.js emulator, although very little of GBA.js can still be seen in mGBA. Read more about mGBA v0.6.2 (GBA emu for Nintendo 3DS)
Colossal Cave Adventure (also known as ADVENT, Colossal Cave, or Adventure) is a text adventure game, developed originally in 1976, by Will Crowther for the PDP-10 mainframe. The game was expanded upon in 1977, with help from Don Woods, and other programmers created variations on the game and ports to other systems in the following years. [Text from Wikipedia] Read more about Colossal Cave Adventure v1.1 (3DS Game)