As used and recommended by Michael & AusClicks:
Backblaze – Online backup for your Mac or PC.
Box – Cloud storage, secure content and online file sharing.
Buffer App – Content marketing without the spam.
CMS Commander – Manage all your WordPress sites with one login.
Eventbrite – Online Ticketing
GoDaddy Australia – Domains and other services. Save 30%.
Gravity Forms – The best way to do forms in WordPress.
Hover – Domains and Email Hosting.
Mail Chimp – Email marketing & Newsletters.
ManageWP – Manage all your WordPress sites with one login.
Moo Business Cards – This is where I get our popular business cards.
SiteGround – Website hosting.
Zoho – Online email & hosting, documents, CRM etc.
* Please note – some links are affiliate links.