I see coolant leaking out of here :

underneath the throttle body,
there is a 1-3/4 or 2" hose coming from the radiator side, goes into a housing ,
there is also 3/4" or so, hose coming from the heater core from the firewall.
these 2 look like they meet underneath the throttle body, the leak is coming from the underneath side of where these 2 meet. Scratch that, looking more closely, the two appear to go to separate housings.

The right one looks like it might be the thermostat housing ? in any case it appear to be leaking underneath where the heater core line meets that housing.

Any ideas ?

is that the thermostat ?