Any recommendations on plugins & third party integrations for Square Space website?

Hi! I've recently switched from Shopify to SS because I love how square-space minimalistic designs and its flexibility to design unlimited page sections. I am used to using apps integration to boost my website as in " Tidio (live chat), smile.io (affiliate marketing), page-designer, wishlist, megamenu (limited but mostly on free plan) that Shopify offered.  I would appreciate if you guys would recommend me some plugins that is compatible with 7.1 version templates. Note: I haven't found any extensions similar on SS, or am I missing something. 

Kind regards,

Supremo