On what engine do you want to port these games? If on Source, there are(or where) several projects, working on it... But it was long time ago and I dont't know if these projects are alive now...
Half-Life 1 WC Maps? May be you wanted to say Half-Life 2 WC Maps? If so, first you need to tweak the Hammer editor which is included if the Beta. It's located in bin folder. This only nedeed if you want to fix or somehow edit the sources. If you want just to compile some sources, you can use .bat file method.
First create txt file and write there these lines:
@echo off
vbsp.exe folder, in which you source file(vmf) is located
vvis.exe folder in which the first-step-compile bsp file would be put
vrad.exe folder, in which the fully compiled bsp file would be put
pause
Then save it as a .bat file(change .txt on .bat). Then put this file in bin folder. You can name this bat file as you like, i.e compile.bat
This is example of my compile.bat
@echo off
vbsp.exe G:\mappack\hl2-wc-maps\aaron\c17_01_13.vmf
vvis.exe G:\mappack\hl2-wc-maps\aaron\c17_01_13.bsp
vrad.exe G:\mappack\hl2-wc-maps\aaron\c17_01_13.bsp
pause
Just make your file like this one(change only the ways to the sources) and then just run it and wit until process will end.
ANON is a man, who has stolen the information from Valve's network, including maps, sources and engine.
As you know, first HL2 was made on an improved engine of HL1 and only later the idea of Source had been created. So the pieces of the old engines where located in the all network, and ANON just swept everything what he can and only then he "constructed" that Beta, which you can download from this site. It's not what Valve wanted to show on E3, it's just ANON's compile of the engine sources which he had found. Or may be not
Nevertheless, it works.
That's why you can found old HL1 sounds and textures in the files of the ANON's build. Because they where in Valve's network, but ANON didn't know this and compiled everything he found in one game.
Well, real ANON's name is Axel G and he was arrested... It's a long story, but you can read this article(it's in English) about the development of HL2 and ANON and everything connected with it -
http://www.gamespot.com/features/6112889/index.html