Assertion: thunderbird | /r/HasProperty | open source software
Facets:
Source sentences:
text: Thunderbird is open source software.
text: Since Thunderbird is open source, it can be improved and modified by thousands of programmers, developers and security techs.
text: Thunderbird is an open source e-mail client.
text: Thunderbird is open source software, meaning that anyone has the right download and use the program for free, and view and modify the source code under the terms of the license .