Here's another excellent example of makers getting together and giving back to the community.
(and other Product Hunt #1)
Skribbl is a growing collection of free, hand-drawn illustrations.
The community gives aspiring creators a place to showcase their work, and a place where those who want to pursue their passion can learn for free.
The illustrations are grouped by niches and topics such as startups, work from home, travel, health and fitness, and many more.
Whatever you can see and download is completely free to use, without attribution.
Another tool to find free illustrations for every occasion is UnDraw.