Multi-Mechanize is an open source framework for web performance and load testing. It allows you to run simultaneous python scripts to generate load (synthetic transactions) against a web site or web service.
Nagios is an Open Source host, service and network monitoring program. The monitoring daemon runs intermittent checks on hosts and services you specify using external "plugins" which return status information to Nagios. When problems are encountered, the daemon can send notifications out to administrative contacts in a variety of different ways (email, instant message, SMS, etc.). Current status information, historical logs, and reports can all be accessed via a web browser.
NeoLoad is a Load Testing and Stress Tool for Web Applications. By simulating a large number of users accessing your application, NeoLoad tests the robustness and the performance of the server under different loads. A clear and comprehensive test report pinpoints errors and bottlenecks.
Open Twebst is an open source web automation framework + web recorder for Internet Explorer that can be used within any environment that supports COM, from scripting languages JScript, VBScript to higher level programming languages C#, VB.Net, VBA/Excel, C++.
OpenPavilion is a free surveillance suite made for observing, monitoring and benchmarking your applications and networks. There are many independent tools being distributed with databases, servers, network components, applications and operating systems. But every tool needs an own operator and monitoring tasks. There was no free OpenSource tool that united all these values inside a holistic monitoring dashboard - that is where OpenPavilion comes to play: OpenPavilion allows people to span mixed perspectives on business and technical aspects. OpenPavilion displays comprehensive relationships using simple to understand dashboard views.
OpenSTA is a distributed software testing architecture designed around CORBA. The current toolset has the capability of performing scripted HTTP and HTTPS heavy load tests with performance measurements from Win32 platforms.
OPNET Panorama is an application monitoring and analysis software that delivers comprehensive performance management for critical Java and .NET applications throughout the application lifecycle, beginning with development and QA, and continuing through deployment and operations. Panorama continuously monitors thousands of system and application metrics within each server, across all tiers, and automatically spots performance anomalies with advanced deviation tracking.
Netflow Generator creates artificial NetFlow Version 5 data streams without the need for NetFlow compatible hardware. It is the perfect tool for testing the NetFlow functionality of PRTG or other NetFlow compatible programs. NetFlow Generator runs on a PC and sends NetFlow 5 Packets (via UDP) to a specific target computer which processes the data. You can create various patterns and loads of traffic. While the simulator is active it will create NetFlow packets which contain information about the selected traffic pattern. These packets contain the same information as a router/switch would send if it saw the simulated traffic pattern (the simulated traffic itself is not generated).
Paessler Netflow Tester dumps the data of all Netflow packets that a computer receives from a Cisco router. This can be useful when debugging bandwidth monitoring configurations based on Cisco's Netflow protocol. First the Netflow protocol must be enabled and configured on the router. Then the router must be given the IP address of the computer running Netflow tester so that the UDP data packets with Netflow data are sent to that computer.
With Paessler SNMP Tester you can run simple SNMP requests against a device in your network. During the test each single step of the SNMP request is logged into a logfile for analysis. The idea of this free program is to debug SNMP requests down to the protocol level in order to find communication and/or data problems in SNMP monitoring configurations.