I was having a conversation with a few people who were interested in creating a technical project from ground up. As you may expect, that takes a lot of time and resources to build something from scratch. In this case, they needed to design the graphics for it as well as the program itself. It was then discovered that there was actually a wealth of open source resources for them to use free of charge to help them do things way faster.
Another way of thinking of open source is pretend say you can get a piece of music that is royalty free where you can modify it as you please and use it wherever you want. So with this they were actually able to scrap a lot of thoughts that they would be forced to spend hundreds of dollars in various productivity software and resources to get started.
If you are really tight on money, this can be a great thing to look into if you are just starting out and could use all of the free resources you can get your hands on when it comes to these technical items.