melonDS v0.5 is released. melonDS is an open source Nintendo DS(NDS) emulator. melonDS is part of a second wave of DS emulators. There are a few other emulator projects that are part of it, which you might have already heard of. Either way, check them out!

melonDS Features:
* almost-complete 2D graphics
* 3D graphics (software renderer) with texturing, alphablending, lighting
* input: keyboard and joystick, touchscreen
* backup memory
* booting from the BIOS
* resizable video output window, preserving aspect ratio of individual screens

melonDS Changelog:
• new UI, more stable, less windows all over the place
• wxWidgets ditched, lost some weight
• 2D: allow reading BLDALPHA
• GPU: fix potential issues with VCount write
• implement 8bit accesses to some registers
• 2D: mosaic (not quite right for rotscaled sprites)
• 3D: fix culling
• allow 128KB firmwares from DSi/3DS
• 3D: more accurate fog
• 3D: more accurate polygon edges (but not perfect)
• 3D: antialiasing
• 3D: misc optimizations

How to use
melonDS requires BIOS/firmware dumps from a DS. You can dump them with the following dumper.
The files must be placed in the same directory as the melonDS executable, as follows:
* bios7.bin -- ARM7 BIOS, 16KB
* bios9.bin -- ARM9 BIOS, 4KB
* firmware.bin -- firmware, 256KB or 512KB

Note: the DS-mode firmware in the 3DS isn't bootable. It only contains the bare minimum required to run DS games. Be sure to enable direct game boot when using a firmware dump from a 3DS.

Settings
Emulation: settings related to emulation. For now it lets you enable direct game boot (directly runs the game instead of going through the firmware).
Input: allows you to configure keyboard and joystick input. You can change a mapping by clicking the corresponding entry, then pressing a keyboard key or joystick button. For now, joystick input uses the first joystick available if multiple joysticks are plugged.

Download: melonDS v0.5
Source:Here