EssentialPIM - EssentialPIM is a free Personal Information Manager that keeps up with the times and lets you manage appointments, tasks, notes, contacts, password entries and email messages across multiple devices and cloud applications.
Notezilla - Colorful & powerful sticky notes app for Windows & Phones.
KeePass - KeePass is an open source password manager. Passwords can be stored in highly-encrypted databases, which can be unlocked with one master password or key file.
eM Client - eM Client is a fully-featured email client for Windows and macOS with a clean and easy-to-use interface. eM Client also offers features for calendars, tasks, contacts, notes, and chat.
VueMinder Calendar - Take control of your schedule and get reminded wherever and however you want.
KeePassXC - KeePass Cross-Platform Community Edition - A community maintained fork of the popular KeePassX...