What are your favorite tools during a TTRPGs sessions?

Hi! Whenever I am playing a DnD or Cthulhu game, it seems I use a lot of applications make the creation and management of thoses awesome afternoons/night easier, like Alkemion, Roll20, etc.. What are the apps that you like most? If you want to give your games a captivating ambiance by incorporating sfx and musics, you might want to give a try to Wavve that launched recently, and is in heavy development to prepare the launch of future awesome features https://www.producthunt.com/posts/wavve-3