Skizzle Email is described as 'Browser Extension that allows users to share secure end-to-end encrypted file attachments through email, where users own and control their keys and data, without the hassle of managing/storing them' and is an app in the Security & Privacy category. There are more than 10 alternatives to Skizzle Email for a variety of platforms, including Mac, Windows, Linux, iPhone and Online / Web-based. The best alternative is Nextcloud, which is both free and Open Source. Other great apps like Skizzle Email are Dropbox (Freemium), Google Drive (Freemium), ProtonMail (Freemium, Open Source) and VeraCrypt (Free, Open Source).
You should have full control over your data. We help you achieve that: a safe home for all your data. Secure, under your control and developed in an open, transparent and trustworthy way. We are Nextcloud.
GnuPG allows to encrypt and sign your data and communication, features a versatile key management system as well as access modules for all kinds of public key directories. GnuPG, also known as GPG, is a command line tool with features for easy integration with other applications.
Tresorit is the end-to-end encrypted file sync and sharing solution which safeguards confidential information by design. Unlike other public cloud vendors, Tresorit has no access to users’ files, which ensures maximum confidentiality.