Visual DAQ DaqPlaner is a free two-dimensional data analysis software. It is a document based (*.daqp) personal data management system.
Major features are:
=> You can manually enter 2-dimensional data in to the spreadsheet and can chart its spatial distribution. => Simple-to-use: You can copy/paste data between DaqPlaner and external data sources like an MS Excel file. => You can read an XLS file into the spreadsheet and can chart it. Also can export data to XLS files. => DaqPlaner is a document-based system. So you can create and save new daqp documents, and can work on multiple documents at a time. => Microsoft Excel is not required to be installed on the machine.
See http://visualdaq.com/DaqPlaner/ for more details.