As a network engineer I have a subset of tools, which I use for configuration and especially during throubleshooting. I will try to list my most important tools and a short description of their functions.
For testing spam and virus solutions the Declude online tools provides you a way to send bogus spam and virus messages. Very useful after deploying anti-X solutions.
Interface Traffic Indicator
This tool is comparable to STG. Interface Traffic Indicator is a tool that requests IN/OUT octet data (MIB2) from SNMP-capable network interfaces. You can use this program in a professional network environment to monitor selected network interfaces (even backplane ports if the device provides the information) or you can monitor your home network or cable/modem/ISDN connection to the internet. You can monitor bits/sec, utilization and accumulated traffic.
KeePass is a free/open-source password manager or safe which helps me to manage my passwords in a secure way.
Log parser is a powerful, versatile tool that provides universal query access to text-based data such as log files, XML files and CSV files, as well as key data sources on the Windows operating system such as the Event Log, the Registry, the file system, and Active Directory.
mRemote allows me to manage all my remote connections from different customers in a single place. It currently supports the RDP, VNC, SSH (v1 | v2), Telnet, RAW, Rlogin, ICA and HTTP(S) protocols. The advantage is that all connections can be managed through one console.
Peer Monitor is a highly-features, easy-to-use and reliable ping based network monitor. Peer Monitor is ideal for home LAN or office network and features email & sound alerts, refresh rate that can be set to any period, dynamic DNS, built-in user support, logs activities.
Putty is de saint of all tools I use. Putty can be used for Telnet, SSH and Serial connections to configure and troubleshoot network components.
Putty Connection Manager is a free PuTTY Client Add-on for Windows platforms which goal is to provide a solution for managing multiple PuTTY instances. I really love this tool, because you can manage multiple Telnet and SSH sessions.
STG, which stand for SNMP Traffic Grapher, is a usefull tool for real-time bandwidth monitoring on Cisco switch. By specifying the SNMP MIB’s for ifInOctets and ifOutOctets, you receive real-time bandwidth statistics. However a colleague discover to use a Update Period of, at least, 5000ms, because you can get strange statistics while configuring a smaller Update Period.
Tftpd32 includes DHCP, TFTP, SNTP and Syslog servers as well as a TFTP client.
The TFTP client and server are fully compatible with TFTP option support (tsize, blocksize and timeout), which allow the maximum performance when transferring the data.
UNetbootin loads utilities or installs Linux/BSD to a partition or USB drive without a CD. It can use an existing disk image/kernel/initrd file, or download a supported distro or system utility (such as Ubuntu, Fedora, openSUSE, FreeBSD, PartedMagic, etc