There are several ways of using TECkit. You can either use TECkit's own language or you can use UTR22 XML format and a perl script also developed by SIL. The Myanmar Unicode converters here use the UTR22/XML approach.
Converters for the encodings used by Geocomp Academy and WinMyanmar Systems have been implemented. You can download these here.
Once you have a converter file, you then need something to do the conversion. Several tools are available for Windows to use tec files.
The current author has also developed a Java front end to TECkit called DocCharConvert, which works on Linux and Windows. It can read OpenOffice files in OpenDocument format, convert the text and adjust the font styles automatically.