UOT represents one of the less common formats based on OpenDocument schemes and as such is supported in programs that adopted OpenDocument formats. So if you are looking for a way to convert them to something more common like document formats from MS Office, you have to find a word processor that supports both of these formats and simply use File ► Save as.. function.
Convert Unified Office document to Microsoft Word Open XML document.
We have found one software suitable in our database for this conversion.
Apple macOS / Mac OS X software - convert uot to docx on OS X
A full-featured set of office applications for Mac OS X
Convert from uot file format
The table with program actions contains information about what each program is capable of doing with their files. This may be a good pointer for further searches for certain file conversions and help you find the converter you are looking for if our search result is insufficient for you. However, it is far from perfect and may sometimes show results which are not really usable because of the nature of the software handles the files. So a conversion that appears as possible, just because of matched actions, may in fact not be possible.