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Apache ActiveMQ is the most popular and powerful open source messaging and Integration Patterns provider.

ifdepd implements dependencies between network interfaces in a reliable way. If any of the source interfaces fails, ifdepd sets all destination interfaces to state down. If all source interfaces are active, ifdepd sets all destination interfaces to state up. For example, it can be used with carp(4) to provide failover functionality on gateways/firewalls. ifdepd is a simple replacement for ifstated and was written because of problems with ifstated. Alexander Hausner <alex@hugo.bmg.gv.at>

Iffinder is a tool for discover IP interfaces which belong to same router.

KNC is Kerberised NetCat. It works in basically the same way as either netcat or stunnel except that it is uses GSS-API to secure the communication. You can use it to construct client/server applications while keeping the Kerberos libraries out of your programs address space quickly and easily.

Bindings for GNU libgsasl.

Client library for the XMPP protocol.

This is a piece of software that lets you tunnel IPv4 data through a DNS server. This can be usable in different situations where Internet access is firewalled, but DNS queries are allowed.

The HTTP Time Protocol (HTP) is used to synchronize a computer's time with web servers as reference time source. Htpdate will synchronize your computer's time by extracting timestamps from HTTP headers found in web servers responses. Htpdate can be used as a daemon, to keep your computer synchronized. Accuracy of htpdate is usually better than 0.5 seconds (even better with multiple servers). Htpdate can also work through http proxy.