X.509 Certification Authority management tool for GNOME

 gnoMint is a tool for easily creating and managing certification authorities.
 It provides fancy visualization of all the pieces of information that pertain
 to a CA, such as X.509 certificates, CSRs, and CRLs.
 .
 gnoMint is currently capable of managing a CA that emits certificates that are
 able to authenticate people or machines in VPNs (IPSec or other protocols),
 secure HTTP communications with SSL/TLS, authenticate and cipher HTTP
 communications through Web-client certificates, and sign or crypt email
 messages.