What do you regard as essential generic (non XF) add on's for a forum ?

[Automotive101]

Open question to all.
new XF Automotive forum, got a potential list of add ons that i'm cutting and cutting again into an essential and non essential list, but would like to hear from user experience what is out there ?

for context I have the official XF Add ons
and I have short listed the following for my automotive site

s9e Media Sites by Xenforo
Ads Manager 2 by Siropu
Link Directory by Xenaddon
Calendar by XF2 addon

I am open to suggestions on what's you have used from your...

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What do you regard as essential generic (non XF) add on's for a forum ?

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