Yes you can.
You need to create an ad hoc network which includes your laptop and whatever device you intend to connect to the internet. Enable Internet Sharing by opening System Preferences and click Sharing.
On the drop down menu you need to select the device that is connected to the internet itself (laptop) and the list provided will allow you to select the device you want to share with the other computers. So I think for you it would be Ethernet as the device connected to the internet but that is only a guess.
Now create the adhoc network. Go to Airport options and you'll be asked to type in the name for your network. Enable encryption if you're wise and make a password. With your other devices, you need to search for new networks and select that new ad hoc network you created.
I know nothing of the software you're asking about because I've never had a need for it.