The URL is aisafety.world
The map displays a reasonably comprehensive list of organizations, people, and resources in the AI safety space, including:
You can hover over each item to get a short description, and click on each item to go to the relevant web page.
The map is populated by this spreadsheet, so if you have corrections or suggestions please leave a comment.
There's also a google form and a Discord channel for suggestions.
Thanks to plex for getting this project off the ground, and Nonlinear for motivating/funding it through a bounty.
PS, If you find this helpful, you may also be interested in some other projects by AI Safety Support (these have nothing to do with me).
aisafety.training gives a timeline of AI safety training opportunities available
aisafety.video gives a list of video/audio resources on AI safety.