A few months ago, i've decided to have a look at the source code of gpSP, released by Exophase + zodttd + notaz (google it...). I've played with for a while and managed to get it compiled with CodeBlocks.
Because i'll be busy, due to professional stuff (yeah, i still work), i've decided to release it, as is, to the crowds so that it will eventually motivate young student programmers into the game console development world.
It has sound and a GUI very similar to the one found in the ti-nspire by calc84maniac. So here it is. Play with it and see if you can learn some useful stuff.
To run some games, as usual, we'll need to find the games and the bios file named 'gba_bios.bin', which i can't distribute for obvious reasons.

Please find in youtube description, how to download both the executable and the source code.
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To compile it, you'll need the following libraries SDL and ZIP installed,e.g:
        <CodeBlocks-install-dir>\MinGW\lib\
            libSDL.la + libSDL.dll.a
            libSDLmain.a
            ..
            libz.a
            zlib.dll.a
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Have some more fun,

However you'll need to do some work before it's better than VisualBoyAdvance.

Well, that's not the point here! I agree that VisualBoyAdvance is a rather good and established emulator, but if you care to have a look at the source code, you'll be surprised because it is not so tidy as you would expect and wish it to be. IMO, gpSP is much simpler (maybe, faster too) and the source code is easier to follow. Also, you (not me ) can always try to add some extra features if you wish and have the required knowledge.

Are there many bugs?

Nope, not that i'm aware of, anyway.

Interesting, but shouldn't this topic be located in the computer section, since this is not a calculator project?

So does it emulate well enough for games to "think" that it's a gameboy?

I'm not a game guru, perhaps you may have a look into the 'docs' folder, read the 'game_config.txt' file and see if it clarifies your worries. Also, why don't you test it yourself?

Interesting, but shouldn't this topic be located in the computer section, since this is not a calculator project?

You're probably right. Feel free to move it there, i  don't care, but i guess it has some loose connection with some calc projects.

(Note that as a news editor, this is pretty much all that I can do besides locking my own topics )

Everyone can lock his own topic here.