Sketch: Our goto design tool
Invision: Tool to share designs and create prototypes (25$/month)
Avocode: Tool for the front-end guys to inspect the designs (243$/Year)
Nucleo: icon management 49€ (one time, optional 49E a year updates we currently don't use)
Other popular tools
Balsamiq: Quick wireframes/mockups.
Figma: Sketch+Invision+avocode in one , both web and native apps.