What are some alternatives?
When comparing Let's Encrypt and ClickSSL, you can also consider the following products
OpenSSL - OpenSSL is a free and open source software cryptography library that implements both the Secure Sockets Layer (SSL) and the Transport Layer Security (TLS) protocols, which are primarily used to provide secure communications between web browsers and …
SSL2BUY - SSL2BUY is the foremost SSL certificate provider of online security solutions for businesses.
FileVault - FileVault is a method of using encryption with volumes on Mac computers.
Digicert - Encryption & Authentication
Ensighten - Ensighten provides enterprise tag management solutions that enable businesses manage their websites more effectively.
SafeCyberSSL - SafeCyberSSL is a platinum partner of leading Certificate Authorities.