FESAPI is an open source library providing a development kit for developers willing to read and or write RESQML™ data objects on files or on ETP™.  It is multi-platform (Windows, Linux) and multi-language (C++, Java, C# and Python)

It also supports some of the WITSML™ v2.0 and PRODML™ v2.1 data objects (FluidCharacterization mainly)