This is the FreeBSD Ports Collection. For an easy to use WEB-based interface to it, please see:

https://ports.FreeBSD.org

For general information on the Ports Collection, please see the FreeBSD Handbook ports section which is available from:

https://docs.freebsd.org/en/books/handbook/ports/
    for the latest official version
or:
The ports(7) manual page (man ports).

These will explain how to use ports and packages.

If you would like to search for a port, you can do so easily by saying (in /usr/ports):

make search name="<name>"
or:
make search key="<keyword>"

which will generate a list of all ports matching or . make search also supports wildcards, such as:

make search name="gtk*"

For information about contributing to FreeBSD ports, please see the Porter's Handbook, available at:

https://docs.freebsd.org/en/books/porters-handbook/

NOTE: This tree will GROW significantly in size during normal usage! The distribution tar files can and do accumulate in /usr/ports/distfiles, and the individual ports will also use up lots of space in their work subdirectories unless you remember to "make clean" after you're done building a given port. /usr/ports/distfiles can also be periodically cleaned without ill-effect.