It may be possible to export .otc files (OpenDocument char templates) as PDF documents, BUT, it may be somewhat pointless to do so, unless the actual template shows something except for the settings. Usually finished charts are exported as PDF files, not templates.
Convert OpenDocument chart template file to Adobe Portable document format.
We have found 2 software records in our database eligible for .otc to .pdf file format conversion.
Multiplatform software - convert otc to pdf on any platform
A free multi-platform productivity office suite for Windows, Mac and Linux
Convert from otc file format
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned otc to pdf. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
An open source personal productivity suite for Windows, Macintosh and GNU/Linux