Convert/manipulate csv files, Java / GUI Swing; GPL3. Uses Ostermiller Utils (CSV Java, http://ostermiller.org/utils/CSV.html) Alows to define rules for the conversion (copy or replace the contents). Useful eg. for serial mail.
OSM XML to CSV conversion. POI only, polygons (and polylines, but not recommended) are approximated by centroid. Result is a 3-column table with lon, lat and value (for a particular key to be chosen beforehand).
ktdata is a C++ library for accessing tabular data, like from CSV files. Its goals are:
1. object design
2. portability (Linux and Windows support at least)
3. high performance
4. support for common data file formats, like CSV, ARFF (Weka), etc.