I use TripAdvisor both personally and professionally. The restaurant search function, in particular, has helped me enjoy many memorable evenings with friends and clients.
Pitch is a user-friendly app that lets you create and customize presentations according to your preferences. With a range of animations, fonts and templates, there's something for everyone.
We often use Miro for brainstorming in a larger context. In meetings with multiple participants or alone, the Miro board allows us to gather all information on a topic in one place.
Slack is indispensable for us in its function. It enables easy internal communication and ensures that we can quickly and easily exchange information with every team member around the world. The only thing that could perhaps be improved is the overview, which can quickly lost due the many different channels. Perhaps there could be a notification setting that asks whether you want to keep the channel if you've been inactive for several months.