Personal Information Manager (PIM) for PalmOS. Complex and thorough with cornucopia of tools and functions, from the standard appointments and "to do" lists to weather and map routes. Functions are cross-linked and integrated, allowing, for example adding a birthday date (with appropriate icon) to contacts list automatically adds it to calendar app. Automatically finds contacts, etc. already existing on Palm and auto-loads into Agendus Pro, along with an easy and self-deleting installer, all for under $40.00. Standard version is available for $30, but reviewer highly recommends advanced features available in Pro edition. Overall, learning curve is a little steep, but with extensive functionality and superb support, Agendus Pro is exceptional.