Open sourse software is free software available to anyone with an internet connnection. They are able to be constantly upgraded because of its basis on a sourse code. I have here 5 examples of open sourse software.
Open office: It is very similar to Microsoft word and is used for word processing
Gimp:This is the open sourse version of photoshop
Audacity:With this program you can make music and sound effects for a song or as an audio track for a movie
Open movie editor:As the name suggests this is for editing videos
Wordpress:A free blogging site, much like this one 😉