Teknik Mail is described as 'Teknik was created to provide users with web services that they can trust. Services range from url shorteners to pastebins and encrypted file uploads' and is an website in the Office & Productivity category. There are more than 50 alternatives to Teknik Mail, not only websites but also apps for a variety of platforms, including iPhone, Android, iPad and Windows. The best alternative is ProtonMail, which is both free and Open Source. Other great sites and apps similar to Teknik Mail are Gmail (Free), Tutanota (Freemium, Open Source), Outlook.com (Freemium) and Posteo (Paid, Open Source).
Horde Groupware is a free, enterprise ready, browser based collaboration suite. Users can manage and share calendars, contacts, tasks and notes with the standards compliant components from the Horde Project.