1. Cacti
Cacti provides a complete graphing framework for data of nearly every sort. It includes templates to monitor a wide variety of devices, from Linux and Windows servers to Cisco routers and switches, and collections of contributed templates cover an even greater variety of hardware and software. There really is no comparison to this tool in either the open source or commercial world.
2. IPCop
A fork of Smoothwall Linux, IPCop runs on any old x86 host and simplifies setup with a Web-based management GUI and the use of three color-coded security zones to partition the network. Real-time scrolling graphs show CPU and memory usage, while reports give you traffic statistics on your red, blue, and green zones and the connections established on each network.
3. Kamailio
Kamailio is the open source SIP proxy server formerly known as OpenSER. Used with an Asterisk IP PBX server for phone features, plus a hardware gateway for connection to the outside world, Kamailio brings important call handling and scalability benefits to Asterisk, while also removing the Asterisk server as a single point of failure. Larger organizations get the phone features they need, as well as the added safety of VoIP calls surviving an Asterisk server outage.
4. KeePass
KeePass is a password manager that runs on Windows (and Mac OS X, Linux, and BSD systems running Mono). It stores passwords for all of your applications and Web sites in a single encrypted database, and lets you retrieve them with a single master password, or a key file stored on a floppy, CD, or USB stick — or both. You can run KeePass itself from a USB stick and lock it to a Windows user account. Among other nice features, it will generate strong random passwords for you.
5. Nagios
Nagios is just about everything a system or network administrator could ask for in a monitoring package. The Web GUI is fast and intuitive, the back end is extremely robust, e-mail and SMS notifications can be managed very granularly, and plug-ins exist for a massive array of hardware and software — almost anything that speaks IP. Nagios’ immense capabilities can present a significant learning curve.
6. Openfiler
Openfiler is a SAN/NAS appliance, based on rPath Linux, that joins impressive scalability and storage management capabilities with modest hardware requirements. Openfiler can talk to disk drives on IDE, SAS, SATA, SCSI, or iSCSI interfaces, and it’s compatible with popular RAID hardware and Ethernet NICs, including 10 Gigabit controllers from Intel and Broadcom. It’s a broad-shouldered storage system that requires some time to learn (or an Openfiler support package).
7. OpenNMS
Open source enterprise monitoring leaders OpenNMS and Zenoss share a number of advanced features that separate them from the likes of Nagios and Cacti and approach the high-end commercial offerings from HP, IBM, and CA. Whereas Zenoss has a broader set of features, thanks to proprietary modules, OpenNMS is purely open source. Customers get all of its advanced functionality free, paying only for support or training services.
8. Untangle
Untangle bundles numerous open source tools including SpamAssassin, ClamAV, Snort, and L7-filter into a network security gateway software appliance that pretty much does it all: anti-spam, anti-virus, anti-spyware, anti-phishing, ad blocking, protocol filtering, firewalling, intrusion prevention, VPN, and of course routing with QoS. Untangle even provides updates to the applications, signatures, filters, and category lists along with nice reporting.
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