Life Time Deals
Software available for a life time deal. A great way of getting applications for writing, social media marketing, image creations etc. without having to pay a monthly fee.
Calendar and Scheduling Tool: TidyCal
Calendar and Scheduling Tool available from AppSumo
TidyCal: very similar to Calendly but with the benefit of being available as a life time deal. It integrates with PayPal / Stripe for payment