PureTLS implements the SSLv3 and TLSv1 protocols, with a number of cipher suites. Both client authentication and renegotiation are supported. PureTLS is able to read keys out of a subset of OpenSSL-style keyfiles, which makes generating keying material easy (i.e., use OpenSSL). No support for key generation is currently provided, but it may be provided in a future release.
pyCA is a project to create Certification Authority in Python. It will generate a CA certificate hierarchy and initial CRLs, generate certificate requests with widely used web browsers, provides a search tool for client certificates in the OpenSSL certificate database, download of client certificates/certificate revocation lists with appropriate MIME types, storing all certificate data in LDAP repositories, scripts for the handling of the certification process on a non-networked system holding the CA's private key(s) and fairly easy configuration based on the OpenSSL configuration file.
Qmail-Scanner, (also known as scan4virus) is an addon that enables a Qmail Email server to scan all gatewayed Email for certain characteristics. It is typically used for its anti-virus protection functions, in which case it is used in conjunction with commercial virus scanners. but also enables a site to react to Email (at a server/site level) that contains specific strings in particular headers, or particular attachment filenames or types (e.g. *.VBS attachments). It also can be used as an archiving tool for auditing or backup purposes. Qmail-Scanner is integrated into the mail server at a lower level than some other Unix-based virus scanners, resulting in better performance. It is capable of scanning not only locally sent/received Email, but also Email that crosses the server in a relay capacity. It also has SpamAssassin support.
renattach is a stream filter that can identify and act upon potentially dangerous e-mail attachments. It's a highly effective way of protecting users from harmful mail content (virii and worms) by disabling or removing attachments that may be accidentally executed by the user. It is written in pure C and can quickly process mail with little overhead. Unlike a conventional virus scanner, there are no specific virus or worm definitions. Instead, it identifies potentially dangerous attachments based on filename extension and on encoded body content. It can be used from within sendmail, postfix, procmail, or pretty much anywhere else.
RIG (Random Identity Generator) is a free replacement for a shareware program out there called 'fake'. It generates random, yet real-looking, personal data. It is useful if you need to feed a name to a Web site, BBS, or real person, and are too lazy to think of one yourself. Also, if the Web site/BBS/person you are giving the information to tries to crosscheck the city, state, zip, or area code, it will check out.