mtCellEdit is a lightweight spreadsheet program that is designed to handle simple day to day tasks. I have put the most important facilities I want into a small customized program which means I can avoid the problems of larger programs such as slow operating speeds and overcomplicated user interfaces.
ErgoTabcalc is a general calculation and report system. Calculation sequences are stored in the database. These sequences are made from simple operations on data, eg, add two table columns, or sort a table. This is similar to relational algebra.
Concalc is a console spreadsheet program for windows written in dev-c++ (mingw) what has all the most common features, all files are available and fully working from the moment when this project was created on SourceForge, includes FAQ.
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...Provides an API to write applications that read Excel documents. The xlreader tool converts data to tab delimited, CSV or SQL inserts. Written in C. Based on the the Java version by Andrew Khan.