To install the premades, Download and then put in "chmod +x file", and then run via ./file (replacing file with the name of the app/file ofc)
To install the source (for if the file doesnt work, or if you are sketched out), compile with GCC (or compiler of your choice, but the command might be different) using the command instructed in the file, and then run with ./file (Edit if needed, as not all Linux systems are the same.)