No extra software but you can sync through Bluetooth: http://kb.palm.com/wps/portal/kb/common/article/32859_en.html
If you're using a desktop, and don't have built in Bluetooth, you can purchase a little dongle that will fit in a USB port: http://www.newegg.com/Product/ProductList.aspx?Submit=ENE&DEPA=0&Order=BESTMATCH&Description=bluetooth+dongle They are at least not nearly as expensive as a new PDA!