Anima App - Design, get feedback, convert to code, publish, iterate.
ChargeOver - ChargeOver automates recurring billing, subscription billing, & payment acceptance. A SaaS that integrates with Xero, Quickbooks, & has an API. Free trial.
Sketch Repo - Collection of resources for anyone who uses Sketch
Elorus - A super-easy online invoicing & time tracking software
Git Sketch Plugin - Version control for designers
MinuteDock - Web-based time tracking software designed to integrate with the Xero accounting package.