Yes, the ipCore firmware is OpenEmbedded based. Thus there are package feeds that can be used.
We suggest using the Yocto feeds for version 1.7.3.
To add the feeds to your system do the following:
1.) Create a new config file in /etc/opkg vi /etc/opkg/feeds.conf
vi /etc/opkg/feeds.conf
2.) Add these two lines src all http://downloads.yoctoproject.org/releases/yocto/yocto-1.7.3/ipk/all src armv5te http://downloads.yoctoproject.org/releases/yocto/yocto-1.7.3/ipk/armv5te
src all http://downloads.yoctoproject.org/releases/yocto/yocto-1.7.3/ipk/all src armv5te http://downloads.yoctoproject.org/releases/yocto/yocto-1.7.3/ipk/armv5te
3.) Update the database opkg update
opkg update
4.) Get a list of available packages opkg list
opkg list
5.) Install the desired packet opkg install packet_name
opkg install packet_name