What are some alternatives?
When comparing Let's Encrypt and Digicert, 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 …
VeriSign - VeriSign Authentication Services provides solutions that allow companies & consumers to engage...
FileVault - FileVault is a method of using encryption with volumes on Mac computers.
GlobalSign - GlobalSign offers a range of SSL Certificates with the strongest 2048 bit encryption and value add features to ensure your website is protected.
Microsoft BitLocker - BitLocker is a full disk encryption feature included with Windows Vista and later.
Comodo - Comodo, the leading Internet Security Provider offers Free Antivirus, SSL Certificate and other Internet Security related products with complete protection