License
Open-source software with license allowing for reuse
Software is usually generally copyrighted,
independent of its functionality.
Licenses transfer rights to use the software
from the author to a (potential) user.
Unclear licensing is a huge problem
for using and developing software.
There are a number of licenses for (free) software
that were developed particulary for open source.
Every program with (potentially) more than one user\\ should have a clear license.
…
Note: This section is clearly opinionated. There are definitely other tools available. However, this is the tool the author recommends from own experience.