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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.

CAcert.org is a community-driven Certificate Authority that issues certificates to the public at large for free.

StartCom offers the free (for personal use) Class 1 X.509 SSL certificate "StartSSL Free", which works for webservers (SSL/TLS) as well as for E-mail encryption (S/MIME). StartCom also offers Class 2 and 3 certificates as well as Extended Validation Certificates, where a comprehensive validation (with costs) is mandatory.

Cheap SSL Shop is globally and authorized reseller of trusted SSL certificate authorities namely: Comodo, Symantec, GeoTrust, RapidSSL, Thawte, and GlobalSign. Cheap SSL Shop offers various types of SSL certificates like Domain Validation, Organization Validation, Extended Validation, Code Signing, Wildcard SSL and Multi-domain SSL certificate to provide web security along with great 24*7 live chat support.

Issued immediately, 2048-bit encryption, compatible with 99.9% of browsers. Free 1-yr PCI and website scanning. 30 day money-back guarantee. Buy SSL.

A Chinese Certificate Authority, which focus on Transparency. They are giving away free SSL too.

SSL2BUY is an authorized re-seller of leading certificate authorities likes COMODO, AlphaSSL, RapidSSL, GeoTrust, Thawte, GlobalSign and Symantec. Being a premium partner with leading CAs, SSL2BUY claims to provide same security certificate in cheapest than original Certificate Authorities.

CheapSSLsecurity is the foremost Platinum Partner Company of Symantec™, GeoTrust™, Thawte™, Comodo™, and RapidSSL™ on the web. Being the specialist in SSL security and Platinum Partner of major SSL certificate authorities, A CheapSSLsecurity offers the wide range of SSL certificate securities at the cheapest price on the internet.

ClickSSL offers world's most trusted SSL certificate brands to small, medium and enterprise. ClickSSL was founded in 2009 with a mission to provide maximum website encryption security through leading SSL certificate brands like Comodo, RapidSSL, GeoTrust, Thawte & Symantec and become most trusted SSL provider at low cost. ClickSSL offer a wide range of SSL certificates products based on business nature. We also provide value added service like CSR (Certificate Signing Request) Decoder, SSL installation and SSL finder. »

Comodo SSL Certificate Provider: Buy/Renew Cheap Comodo SSL Certs at $7.45/yr, Including Instant, Positive, Essential, DV, EV & Wildcard SSL at the lowest price!

Wildcard SSL Certificates & 2048 Bit Extended Validation EV SSL Certificate Authentication. Strong Secure Sockets Layer Https Encryption for Network Security.

The SSL Store™, the world's leading SSL Certificate Provider, offers trusted SSL Certificates from Symantec, Thawte, Comodo, GeoTrust & RapidSSL at a low cost.

VeriSign Authentication Services provides solutions that allow companies & consumers to engage in communications & commerce online with confidence. VeriSign Authentication Services include SSL Certificates, Extended Validation SSL, two-factor authentication, identity protection, code signing & public key infrastructure (PKI).