Spike - Spike solves businesses' communication chaos by bringing together email, team chat, collaborative docs, and meetings, into one feed.

Easy Message - Easy Message app comes up with features to help users in effortlessly sending text messages to a phone number, which is not in the contact list.

ProtonMail - Secure email with absolutely no compromises. Get your free encrypted email account today.

Seecrypt - Seecrypt app allows users to do secure voice and conference calls by using advanced encryption features so they can contact their friends, colleagues, and family members without any privacy issues.

Seald - Keep your conversations secure, everywhere.

Silent Phone - Silent Circle is a secure communications firm offering enterprise communications solutions including software, devices, and services.