Easy reference for a gamemaster is key. You just can’t remember every detail of the rules and try to keep the plots and the NPCs straight - unless you’re a GM god, in which case you should be contributing tips here instead of just reading them!

I find using a laptop at the table greatly helps me in having things near at hand, and one of my most frequently used tools is d20srd.org . It’s the complete SRD, but better organized and easy to use.

If you like having your tools offline, registration for the site is cheap and gives you access to the downloadable version and other niceties.

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