There is small software repository, which may be useful for you:
and other. 
To use it, write those two string to /opt/etc/ipkg.conf:
	Code:
	src/gz wl500g-d http://wl500g.googlecode.com/svn/ipkg/optware-d
src/gz wl500g-optware http://wl500g.googlecode.com/svn/ipkg/optware
 So your /opt/etc/ipkg.conf will looks like:
	Code:
	src/gz optware http://ipkg.nslu2-linux.org/feeds/optware/oleg/cross/stable
src/gz wl500g-d http://wl500g.googlecode.com/svn/ipkg/optware-d
src/gz wl500g-optware http://wl500g.googlecode.com/svn/ipkg/optware
dest /opt/ /
 Then update package list:
and install chosen package:
	Code:
	$ ipkg install tmux
 
Update. Please note, no more updates for this repo. Please, use the Entware instead.