What are some small, fast and lightweight open source applications (µTorrent -esque)?

Question

Possible duplicate
What is the best open source example of a lightweight Windows Application?

µTorrent is a small bit-torrent client, a really small one. It doesn't come with an installer, just a exe, you drop in your PATH somewhere. It's super lightweight and yet feature rich. Plus it is the work of one man. It's also closed-source.

Many people have been curious about how it has been written, and there are hints here and there about a custom library etc. But the question is, are there any programs with attributes like µTorrent that are available with source code--attributes like speed, small size, awesomeness.

Possible related question (/questions/9603/what-is-some-great-source-code-to-read), but think smaller than something like the Linux kernel.

Clarification: I don't want examples of bit-torrent source code, but anything which is used by tons of people (validation of awesomeness) and also fast, small and awesome!

Answer 1

rTorrent is a lightweight, feature-rich, console-only open-source torrent client.

Answer 2

I think you should take a look at Notepad++ if you want to see a feature-rich low-consumption of power software :)

Answer 3

FRESHMEAT is a great place to start.
There are lots of small open source programs available that you can study.

Examples:

• XML-RPC specification.C implementation for Python. Its easy to learn and its fun.
• Heapq [\Lib\heapq.py] , xml-rpc [\Lib\xmlrpc] and lots of other codes in Python library are very well written.

Answer 4

I like Frhed, a simple open-source Windows hex editor.

Answer 5

Netcat It's the program that started all of the curiousity behind networks and how things WORK. Everyone's looked at this source code.