Notion: A freemium productivity and note-taking web application that offers organizational tools including task management, project tracking, to-do lists, bookmarking, and more.
Trello: A web-based, kanban-style, list-making application.
Slack: An instant messaging program developed for professional and organizational communications.
Calendly: A scheduling automation platform for eliminating the back-and-forth emails.
Note-taking
Zettelkasten: A Zettelkasten (German: “slip box”) consists of small items of information stored on paper slips or cards that may be linked to each other through subject headings or other metadata such as numbers and tags.
Zettlr: A Markdown editor that allows you to connect pieces of information using the Zettelkasten methodology.
Obsidian: A personal knowledge base and note-taking software application that operates on Markdown files. It allows users to make internal links for notes and then to visualize the connections as a graph.
Scrivener: A word-processing program and outliner designed for authors which provides a management system for documents, notes and metadata.
xmind: A full-featured mind mapping and brainstorming app.
LiquidPaper: A PDF reader and editor which captures your reading, notes, highlights, annotations and observations just like paper; but goes further to reveal their connections: to source materials and each other in a way which documents and maps your project in a clear and shareable form.