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The HD8600 is rather typically equipped. Actually it has 3 HDMI inputs, one more than most, but others these days are adding a third, as well. There's the classic analog computer input, which can be used as the second component video input instead.
There's also the usual composite video and S-video inputs, not to mention an RS-232 and also a USB for command and control from a computer or room control system.
The Optoma comes equipped with two 12 volt screen triggers, which can be used for motorized screen control, controlling an anamorphic lens sled, or a screen masking system. Few projectors have two, although that may be a new trend, considering the expanding range of devices they can be used to "trigger". Nice touch, and it may be convenient, however, controlling all such devices can also be done other ways, with infra-red or RF remotes, for example.