HTTP Time Protocol is a time synchronization tool that uses Web server responses (HTTP headers) instead of the NTP protocol. If you are behind a corporate firewall, NAT device, or proxy server, HTP will still be able to synchronize the time. For high precision time synchronization, use ntpd.
SmbSync is a program to move files between Unix and Windows shares directly, avoiding the need for mounts or extra services like FTP or Rsync. It uses input and output directories, and can be configured to handle many directories and servers. It can retry uploads and downloads that fail, avoids incomplete file transfers, does not touch recently modified files with a configurable timeout, can archive files instead of deleting files transferred, can upload or download to temporary directories so that scripts that trigger on the files will only see complete files, and allows you to configure blocksize.
dim_STAT is a performance analysis and monitoring tool for Solaris, Linux, Mac OS X, and other UNIX systems. Its main features are a Web-based interface, data storage in a MySQL database, several data views, interactive (Java) or static (PNG) graphs, real-time monitoring, multi-host monitoring, post analyzing, statistics integration, professional reporting with automated features, and more.
LFT (Layer Four Traceroute) is a sort of "traceroute" that often works much faster than the commonly-used Van Jacobson method and goes through many configurations of packet-filter based firewalls. More importantly, LFT implements numerous other features, including TCP, UDP, or ICMP-based traces, AS number lookups through several reliable sources, loose source routing, netblock name lookups, and more. LFT also distinguishes between layer-4 protocols, which make its statistics slightly more realistic, and gives a savvy user the ability to trace protocol routes, not just layer-3 hops.
Very Simple Network Monitor is a bash shell script CGI that monitors a number of services on a network. It currently checks for node-up, TCP service up, and UDP service up. A service or system can be put in maintenance status to avoid repetitive alarms. It is easy to customize, trigger alarms by email, or whatever you like (depends on nmap for TCP/UDP service checks). Installation is also simple. It generates HTML with all statuses, and for all services just in one view.
Nagios is a host, service, and network monitoring system that will watch your network and alert you to problems before your clients or end-users do. The system runs checks on hosts and services that you specify using plugins that return status information to Nagios. When problems are encountered, the system will send notifications to system administrators so that they can take action on the problem. The JumpBox for Nagios gives you a head start to using the system. It eliminates the complexity involved in getting the application installed, and allows you to focus on the configuration for your specific environment. Since Nagios is based on plugins, depending on what you want to do this will vary in complexity.
BixData is a cluster management tool that includes monitoring and system administration features. It monitors services (HTTP, ping, POP3, SMTP), performance, and processes. It has a management console for VMWare and Xen that supports multiple virtual machine hosts and guests. It can create critical notifications and send email alerts for any system event (HTTP, ping, CPU, memory, SMART diagnostics, VM stats). A graphical desktop supports real-time dynamic graphs. The runtime agents and server components are lightweight and easy to set up and run.
Network-I is a network analyzer, comprising a fast sniffer (niftap) with a powerful filtering language and a suite of tools to process the captured packets. The possibilities range from the straightforward display of captured packets in exhaustive detail (or alternatively, as one-line summaries) to measurement of traffic rates (which can be recorded to file or displayed in real-time via the GUI) and automated reports on packet retransmissions and losses.