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

Reminder - A better way to keep track of your reminders 📝

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

DearEle - Email reminders made easy for everyone 💌

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

FollowUpThen - The simplest way to schedule an email reminder