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

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

3.) Update the database
opkg update

4.) Get a list of available packages
opkg list

5.) Install the desired packet
opkg install packet_name