Ruby HL7 is a simple library for parsing and generating HL7 2.x messages. 3.x support is planned in the future.
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The PUMA Repository (Pascal units for medical applications) is a collection of reusable source code for bioinformatics. It is compatible with Lazarus and Free Pascal, parts of the source code can also be used with Delphi and winsoft Pocket Studio.
Components of the PUMA repository include a unit converter for transforming instrumentation readouts consisting of a numerical value and a measurement unit, and an HL7 engine for reading, parsing, compiling and writing HL7 messages.