Essential Upsell & Cross Sell

This is hands down the best option for most businesses. Easy to set up, enough options for the average business, and it's SIMPLE. I tried ReSell and ReConvert before this and was incredibly frustrated with how hard it was to use. Yes, they had more features, but it doesn't matter if it's too complex to get launched. Plus this is free!?! This deserves to be used by wayyy more people!