Todoist - Todoist is a to-do list that helps you get organized, at work and in life.

Zuunote - A web-based and Markdown-based note-taking app that's reimagining writing experience in Markdown that everyone can enjoy.

Mendeley - Easily organize your papers, read & annotate your PDFs, collaborate in private or open groups, and securely access your research from everywhere.

Typora - A minimal Markdown reading & writing app.

Zotero - Zotero is a free, easy-to-use tool to help you collect, organize, cite, and share research.

Obsidian.md - A second brain, for you, forever. Obsidian is a powerful knowledge base that works on top of a local folder of plain text Markdown files.