I receive four response , very helpful. 
Here is the groenvel@cse.psu.edu's response ,  it's greatful
>http://www.ugu.com/ has a searchable list of software links.
>http://www.shareware.com/ has some UNIX urls.
>archie is a distributed database of ftp sites, theres an X base client 
at
>ftp.x11.org, you mought be able to find a web based client too.
>I use a package called rzsz, I think it was posted to Usenet a few 
years ago.
And Sue.Gray@Unisa.Edu.Au supply follow site , from which I get the 
rzsz source file , 
thanks very much.
>source from ftp://ftp.cs.pdx.edu/pub/zmodem/rzsz.sh
>patch from 
ftp://freebsd.org/pub/CERT/patches/SA-96:17/SA-96:17-solution
and Mark de Roo even send a package to me , so appreciately
likun@bjaimail.asiainfo.com
asiainfo-ctc co.ltd
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