Let's Encrypt is described as 'Anyone who has gone through the trouble of setting up a secure website knows what a hassle getting and maintaining a certificate can be. Let’s Encrypt automates away the pain and lets site operators turn on and manage HTTPS with simple commands' and is a very popular certificate authority in the security & privacy category. There are more than 25 alternatives to Let's Encrypt for a variety of platforms, including Web-based, Linux, Windows, Mac and Self-Hosted apps. The best Let's Encrypt alternative is ZeroSSL, which is free. Other great apps like Let's Encrypt are acme.sh, Buypass, SSL For Free and DigiCert.
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They also have free SSL certificates.
Because Let's Encrypt is Certificate Authorities and acme.sh is ACME Client, is different
Buypass is established as a major player in securing transactions with electronic IDs and SSL certificates in Norway. We are a trusted European Certificate Authority (CA). Large public enterprises including the majority of the Norwegian health sector, municipal services and the...
The other ones are CA's, this is just a generator for Let's Encrypt
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They have cheap certificates and also several types
Comodo SSL is a service, not software.
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ComodoSSLStore is one of the largest global SSL certificate providers. As a platinum partner for COMODO, they buy SSL certificates in large quantities and pass the savings to you.
This is just another TLS/SSL certificate store which partnered with COMODO as CA, not a certificate authority (CA) itself.
The two are very different, so it should not be considered as an alternative to Let's Encrypt.
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SafeCyberSSL is a Website security platinum partner of trusted Certificate Authorities, which includes Symantec, GeoTrust, Thawte, RapidSSL and GlobalSign. SafeCyberSSL offers different types of SSL certificates at discount price for every size of online business or individuals.
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This is a one of good Let's Encrypt alternative CA.
This CA provides unlimited free TLS/SSL certificates through its ACME server, and these certificates have better compatibility than Let's Encrypt because they use COMODO/Sectigo as their root CA.
The downside is that their ACME server is quite unstable. Occasionally, when attempting to issue or renew certificates through their ACME server, random errors occur, sometimes with a 405 error despite no credential issues, or even a 5xx error.
Subscribing to a paid plan will not solve the problem as long as you are still using the same ACME server. You may want to try using their REST API instead, which has different server, limitations for each plan and may be their REST API server are slightly more reliable.