open source tool
outil à code source libre
Definition:
Open source tools is a phrase used to mean a program — or tool — that performs a very specific task, in which the source code is openly published for use and/or modification from its original design, free of charge. … Learn more about open source tools on Datamation.
Source: https://www.webopedia.com/TERM/O/open_source_tools.html
Remarks: