ActiveCampaign - Email marketing and automation; in my opinion there's nothing that can compete for features and price. Try for free and see what you think.
ActiveMember360 - A membership plugin that perfectly integrates with WordPress and ActiveCampaign for the best of both worlds.
ClickMeter - Track and protect your most important links and gain additional insights on click-through and overall conversions.
ConvertBox (formerly ConvertBar) - Create opt-in forms, mini surveys and more. A great lead generation and segmentation tool that can be used with any site (not just WordPress).
Google Analytics - Free web analytics platform that adds a greater depth of awareness of both what is working and what isn't along with who visits and where they came from to your website.
Hotjar From heatmaps, to funnel tracking to on screen recordings. This is a great tool for improving usability and conversions on your website.
Loom Amazing free tool that allows you to create screen share videos on the fly. Super easy to use.
NameCheap.com - Affordable domain names without the annoying up-sells (I'm looking at you Godaddy!).
Rebrandly An inexpensive way to create your own branded shortened links.
Slack - A team communications tool that offers more privacy and functionality than Skype out of the box.
Thrivecart - Powerful and easy to use shopping cart for both digital and physical goods.
ThriveLeads An amazing WordPress plugin for collecting leads.
ThriveThemes Membership - An affordable and amazingly robust suite of tools for WordPress to become a lead and sales magnet for your business.
WordPress It's 2021 and after 13+ years on the platform, I still recommend starting with a self-hosted WordPress account. A competitor may eventually dethrone it... but not any time soon.
WPX | WordPress Web Hosting - Professional web hosting, top notch customer service...and they actually seem like they really care, compared to most bigger web hosting businesses.
Affiliate Disclaimer
I only recommend products that I have personally used in my business, client work or that has come highly recommended to me by colleagues or mentors that I explicitly trust.
With that said, many of the links on this page are 'affiliate links' which will grant me a small commission if you click on the link and proceed to buy. If this is not to your liking, I recommend that you search for the above products in Google instead.
As always, you're a business owner and it's up to you to look into any product or service and determine it's the right fit for you no matter what I or anybody else may recommend.