Most of my photos have a Creative Commons license which means they can be used & shared with attribution. Often, small news organizations & nonprofits are able to make use of them rather than paying large fees from stock agencies. They're also on many different Wikipedia pages.
If you end up using my work and have the means to contribute, I'd highly encourage donations to Nechama, a Jewish Disaster Relief volunteer organization. They're directly helping communities in rebuilding efforts in Puerto Rico affected by Hurricane Maria.