DarkBlizz

You could just download the client from blizzard, although I forgot what the links were too it.  Or you can just torrent it. 
Could also check these out, don't know how old they are though
http://darkblizz.org/Forum2/sc2-tools/sc2-map-editor-crack/
http://sc2.nibbits.com/assets/starcrack-allin1/
http://www.battle4sc2.com/

Also the crack doesn't allow you to play multiplayer online on blizzard servers, you would still need a cdkey for that. 

Your personal helper when developing for Diablo 3. d3.advanced has been created in order to lower the barrier of entry for Diablo 3 hack and other application developers.

Website: http://d3advanced.com/

Requirements:
.NET 4.0
Microsoft Visual C++ 2010 Redistributable Package (x86)

Download Here

QuoteQuick guide on how you use it:

1. Start Loader
- first time you start it, point it to Diablo III.exe
2. Create a new Profile in the Profile Tab
3. Switch to Process Tab
4. Click on the checkbox running to start an instance
5. Play!

Features: -
- Maphack
* Reveals units on the minimap (regular mobs in red, champs/bosses/rares in blue)
* Displays arrowes to level exits
* Minimap Markers are always revealed!
* The correct defiled crypt is colored in a green!

- Instantly exit games
- Instantly craft
- Displays a timer in the left bottom when ingame
- Displays clock in the left bottom when hanging out in the lobby
- Allowes .NET assemblys to be loaded (create bots)

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Hotkeys:-
F9 - This was added for testing purposes. It allowes you to port your toon to the xyz position where your mouse cursor is currently pointing at. However, this only has a clientside affect and will not allow you to get past boundaries.
F12 - Toggles the console. Only use this if you absolutely have to! Once ~20 lines have been printed into the console it will result in a crash.

-----------------------------------------------------------

Commandline:-
All commands are prefixed with a dot '.' and can be used in the lobby aswell as in game.
<> signs work as placeholders.

.dotnet:-
Syntax: .dotnet <appdomain> <assembly>
Syntax: .dotnet -unload <appdomain>
Syntax: .dotnet -unload
The dotnet command allowes you to load assemblys into specified appdomains. You can unload all domains at once by writing .dotnet -unload or unload specific domains by writing .dotnet -unload <appdomain>.

.levelarea:-
Displays the currently levelarea of your hero. Used to quickly figure out the currently SNOLevelArea.

-----------------------------------------------------------

All .NET assemblies go into the subfolder Assemblies.


Download Here

API Documention:  http://d3advanced.com/help/
For help/support visit here or IRC Server: irc.synirc.net - Channel: #d3advanced

Well you need a beta key in order to play the D3 beta.  However, you could always try out Mooege, the d3 emulator, if you want to mess around in D3 for a bit.   It may not be fully completed, but if you don't have a beta key and want to play around a bit, its your best option, other than someone giving you their beta key. 
Check out mooege.org or check the mooege section on this site.

As most probably know already, you can download the D3 client.
So far I've just seen the Italian client:
http://eu.media.battle.net.edgesuite.net/downloads/d3-installers/589acdb4-c660-318a-b993-01528fad7da6/Diablo-III-8370-itIT-Installer-downloader.exe
I've heard from one person that some have used the sc2 authkey ( http://us.battle.net/static/mediakey/sc2-authenticationcode-enUS.txt) to install the D3 client, although the D3 authkey (http://us.battle.net/static/mediakey/d3-authenticationcode-enUS.txt) is still empty.  So I'm not 100% sure on how that is working.

If anyone has any other info or links to different clients or any other insight, feel free to post.

Blizzard has set the release date for Diablo 3 and you can now pre-purchase your copy.  As noted before though, PvP will not be there on initial launch, but will later be patched in.

http://us.battle.net/d3/en/blog/4612389/Test-3_16_2012

lulz 

more bots the better

Apparently they don't like where PvP is at and are not going to include it when they launch D3 to the public.  They will later add it through a patch.
http://us.battle.net/d3/en/blog/4574895

How will it be different than Starfriend?

nice looking website

Welcome to the site.  If you haven't checked out mooege yet, be sure to do that so you get involved with D3.  (http://mooege.org).
Also check out http://diablo3dev.com.  As always also check out the sections on here related to d3/d2 reversing or general chat and feel free to contribute.
Cheers

edited your post to include code tags so it wasn't a super long scroll. 
Thanks for the tip

Of course its possible to emulate SC2. 
You should also check out http://darkblizz.org/wiki/  although outdated, it would atleast give you an idea of what's going on.
also http://diablo3dev.com/w/Networking

That happens whenever you dont assign a characters file or an empty file to a bncs name. i.e anything under Account Lists thats blank, will cause it to give you that popup msg. 
But it will still connect anyway after to the amount of bots you have designated in 'Launch'.
To prevent this just dont load names u dont plan on using or give all bncs names an account list.

Welcome to site; sure, as long as our affiliate images stays upon yours.