Open Source Debuggers

pwru is an eBPF-based tool for tracing network packets in the Linux kernel with advanced filtering capabilities. It allows fine-grained introspection of kernel state to facilitate debugging network connectivity issues.

Bagel is a little native iOS network debugger. It's not a proxy debugger so you don't have to mess around with certificates, proxy settings etc. As long as your iOS devices and your Mac are in the same network, you can view the network traffic of your apps separated by the devices or simulators. Most basic usage is to start Bagel iOS before any network operation. Since Bagel exposes every request info to the public it would be better if you disable it for the store versions. By default, Bagel gets your project name and device information. The desktop client uses this information to separate projects and devices. You can configure these if you wish. Bagel framework communicates with the desktop client by using Bonjour protocol. You can also configure these Netservice parameters.

NetTool is a developer tool for monitoring and manipulating application-level network messages, particularly useful for debugging web applications and web services. There are two components to NetTool: the HTTP Client, and the TCP Tunnel.

A tool to monitor and analyse data transmitted between clients and a server through a TCP connection. This tool focuses on the data stream (software layer), not on the lower level transmission protocol as packet sniffers do.

Jssltrace is a java-based tool, which enables it's user to intercept ssl based communication between two programs. Jssltrace works essentiallly in the same manner as tcptrace (http://www.pocketsoap.com/tcptrace), which is the main inspiration for it.

Semi-Automated Debugger for TinyOS Network Applications

CorbaTrace is a helpful tool for tracing communications beetween Corba objects. Once CorbaTrace is installed, remote calls are intercepted and informations are stored in XML files. So, you will be able to apply filters and get XMI files to see the commu

This tool is used to develop small applications that can run on MIPS-based embedded Linux devices - mainly WLAN routers. It is possible to debug these applications using GDB with the GDB backend provided by this tool.

The Fault Injection Toolkit is a sophisticated modern protocol fuzzing platform.

GateDebugger may be performed free communication using COM port, TCP / IP, UDP and the like. Further, it can be blocked or free communication data and filter.

JRemoteRun allow execute snippets of java code in running JVM.

NetworkTools has 2 components: A protocol analyzer which plays a TCP client or server or pipeline, which sits between a client and server and shows how they communicate. A port scanner can scan a range of IP addresses and ports. See screenshots.

Parallelized GDB: a tool for debugging parallel programs written in MPICH. Written in C++ and on the brink (hopefully) of usability. Please help develop!

PlugProxy version is a port forwarder/port debugger written in Java. PlugProxy is used to forward data from one TCP port to another. This is commonly referred to as "port forwarding." The purpose of this is to invisibly send a request from one site

Handle every connection on different windows really simple, like chatting! Whit this too you can start a server, what listens on a specific port and/or connect to a specific host name with a specific port. The incomming/outgoing connections are appearing in popup windows. Written in Lazarus

SimpleLogViewer is Java 2 based GUI application that display logging data. Can read a file or listen over a TCP socket. Use plugins/embedded scripts to Hide, Rewrite, Colorize lines of log.

Enables a user to view & alter all aspects of comunications with a web site via a proxy. Primarily used for security based penetration testing of web sites, it can also be used for debugging during development. Seen as part of a hacker toolkit.

LogViewer is a MS Windows .NET application that display logging datas. It's like the unix 'tail'. It can read a file or listenning over a TCP socket. Use regulars expressions to Hide, Rewrite, Colorize lines of log. Have a look at Screenshots section.