Domain registrar and web host Namecheap offers SSL Certificates.
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OpenSSL
Score 9.9 out of 10
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OpenSSL is a toolkit for the Transport Layer Security (TLS) and Secure Sockets Layer (SSL) protocols. It is also a general-purpose cryptography library.
There aren't a lot of downsides with Namecheap SSL [Certificates]. We use them primarily unless a client or contractual needs states otherwise. They are fast, responsive and essentially cheap. This is just because they are a wholesale reseller from trusted certificate authorities like a lot of their counterparts. However their reputation for cost and ease have put them in the top running. As I mentioned, there is basically no support beyond the delivering of the purchased product as requested. In some circumstance, when clients move/switch hosting/marketing representation, transfer of the SSL ownership can be a hassle because you don't have a dedicated support portal. But you get what you pay for and the savings justify it.
I would recommend OpenSSL for just about any kind of cryptographic operations that you may need. I can't think of a particular situation where it would not be appropriate to use OpenSSL for a cryptographic function of some sort or another. If you are going to provide some sort of encryption service in a product, OpenSSL is probably the best way to get it off the ground and going. With other competitors, you may get it working, but I fear long term support and interoperability will be an issue.
They are basically just first party certificate authorities and have the brand recognition that goes with that. NameCheap [SSL Certificates] really is just doing the job of volume negotiations and reselling while integrating a markup and opportunity to sell their various other products (which also have some compelling ROI based on cost and client needs)
LibreSSL is another option to OpenSSL, however, the sheer volume of other applications using OpenSSL and the wide support for it makes OpenSSL a compelling product.
roi is hard to measure for openssl. It's not that it doesn't provide a significant roi, but it is in the background of an application, not the foreground.