SUP stands for Sybase/SAP Unwired Platform. Use sap-smp tag if using version 3.0 or newer.
SUP - the Sybase Unwired Platform - is a development environment and a runtime platform to assist developers in building applications for mobile devices.
SAP's primary strength is that it provides both online and offline support for mobile applications, using an underlying DB replication system to keep synchronized copies of data on the mobile device.
The software has a developer component (written inside of Eclipse) and a runtime component for either Windows or UNIX systems.
Sybase was acquired by SAP, Inc. in August of 2011, as of version 3.0, the name has changed to SAP Mobile Platform. SAP is now using this software as the base for it's mobile development efforts, and has incorporated support for accessing SAP databases.
There is more information on the Sybase/SAP web site, and additional developer resources can be found on the SAP Community Network.