This add-on inserts lexical and interlinear data from SIL FieldWorks into LibreOffice. Other features include Data Conversion using SIL Converters.
The primary site to download releases is https://extensions.libreoffice.org/extensions/lingtools. Source code can be downloaded from github.
For installation instructions and version history, see README.txt
The latest release is 3.0. Help is available from the menu, or you can download it here: Linguistic Tools Help.pdf
The .oxt file is a zipped file with source code included. Most of the code is in the pythonpath folder as described here.
More information for developers is in the following files: