An extended set of scientific functions which converts geographic longitude and latitude coordinates into cartesian coordinates and vice versa.
A UDF library of functions to map relational data to the JSON format.
A UDF library to write debug information to the log files.
Use PCRE regular expressions directly in MySQL
MySQL UDF skeleton project
A UDF library for statistical analysis.
MySQL UDF library providing stemming capability for a variety of languages
A MySQL UDF library to send STOMP messages
A UDF library with additional string functions for MySQL
A UDF library with functions to interact with the operating system. These functions allow you to interact with the execution environment in which MySQL runs.
MySQL udf library for technical analysis
A UDF library with functions that allows one to look directly at the internal structures passed to the UDF.
A UDF library to create XML output directly from MySQL
A listing of open source efforts at Twitter on GitHub