Slack is the best chatting platform for B2B! Not only you can use it to create channels that help track the conversation, but it also has a lot of integrations and automations that make the whole process smoother
Miro is awesome just because it has a visual platform. It's great for both working on your own, as well as teamwork, for you can use timers for quick brainstorms, different templates for anyone's needs!
It's a great tool to keep track of both daily operations, as well as store info for future purposes. Notion, however intuitive, has a lot of different options to help you manage and organise a smooth workflow