[Jerlene]

MyBB - Mods - Custom Pages
You can make an affiliates page to list websites you want to do link exchanges with, instead of taking up space elsewhere[on the index page, etc.].

MyBB - Mods - IPLog Plugin
Keep track of your members easier this way. Make sure they're sticking to one account and not making other accounts to spam users or other things. Also, keep track of those banned and or troublesome members!

MyBB - Mods - Posts Required To View This Forum
Get more visitors to sign up this way.

MyBB - Mods - Side Boxes! 2.0
This one opens up a few spaces for you to run ads and get more revenue.

MyBB - Mods - Contact+ 3.0
A prettier and much easier way for your users to send you messages and for you to receive them.

[Jerlene]

MyBB - Mods - MyBB Search Engine Optimization
This one will make the links in your forums more attractive and it will get you more visibility in search engines.

MyBB - Mods - MyPlaza
Just something you and your users can have fun with. It's a good way to encourage users to post.

MyBB - Mods - Posts Required To PM
Prevent or at least help prevent spammers from spamming via PM.

MyBB - Mods - Forum Warning System for MyBB 1.2.x
MyBB doesn't have an infraction system like vB does. This MOD acts just like one though. It's really helpful when you need to enforce rules and take care of those problem members.

MyBB - Mods - Moderator Control Panel
This is a definite must. It allows your moderators to ban and do other things that aren't available to them and they normally wouldn't be able to.

[Jerlene]

MyBB - Mods - Default Profile v2.0.1
This is good to have so that everyone will have an avatar, website, signature, etc. It makes your site look more full of content and you can also put links to your site in their signature or sell the space if you want.

MyBB - Mods - Adsense Revenue Sharing
This is something that will definitely encourage more users to post.

MyBB - Mods - Hide Links to Guests
Make guests sign up to see links. Increase your member count.

MyBB - Mods - RSS To Post v1.1.0
Make your board full of related content.

MyBB - Mods - Newsletter Plugin
Let your users know what's going on with your site.

[willyoumind]

OMG, I didn't even notice that there are a bunch of list of MyBB MODs, which is definitely my favor of all! Thanks for the list, Jerlene and you're my savor :)

[Jerlene]

No problem. They have some pretty good MODs. Not a lot for the latest version though.