systemli.org is described as 'Systemli.org is a left network and technics-collective that was founded in 2003. Our aim is to provide safe and trustworthy communication services. The project addresses political activists and people who have a particular need to protect their data'. There are more than 10 alternatives to systemli.org, not only websites but also apps for a variety of platforms, including Android, iPhone, iPad and Linux. The best alternative is ProtonMail, which is both free and Open Source. Other great sites and apps similar to systemli.org are Gmail (Free), Yandex.Mail (Free), Vivaldi Mail (Free) and CTemplar (Freemium, Open Source).
Teknik was created to provide users with web services that they can trust. Services range from url shorteners to pastebins and encrypted file uploads. Teknik Mail is a premium feature available after a donation of $5 only