Free for 2d software for windows

Functions 2d Opera widget allows you to enter a mathematical function and have it plotted on a 2D plane The Functions 2d widget for opera browser displays a functions graph on a 2D plane.
Equations are entered as a function of x. An example for a unit circle would be:
f(x) = (1-x^2)^(1/2)
There is one main feature that is missing from this release and that is that the axis do not have markings on them. This is due to the limitation of Canvas not being able to write text, however in a later release I will have my own text implementation.
Note: To install the widget you have to drag & drop the .zip file on the Opera Widgets Manager window.
System requirements:
- Opera 9 or later

File Transfer is an application that allows you to connect to your friends computer, and transfer fast and secure any file or folder.
File Transfer uses a direct P2P connection, that ensure the fastest possible transfer speed between the two computers.
File Transfer is extended with a NAT traversal protocol and is able to directly connect even behind NATs and firewalls. Try it, youll never want to use something else for transfering files!

Grafici 2D 1.1.1 is created to be a simple but effective application that allows for graphing any kind of function in one variable f(x) or in parametric form y(b), x(b). You can also plot more function in one graph and calculate the functions f(x) for a desired value. Moreover it's possible to plot the graph of the derivative of a function, display the relative max and min, the intersections with the axes and makes the zoom of a selected part of the graph.

Requirements: Microsoft .NET Framework 2.0

Internet Maniac is a small and useful network suite which includes a whole bunch of network utilities. It was written in C using win32 API. It calls winsock.dll directly and does not use any third party custom control or dll.
Main features:
- Host Lookup
- Ping
- Traceroute
- Raw Connect
- Listen to UDP packets
- Network Time
- Finger
- Whois
- Active Connections
- Scanner
- Mail Check
- Speed Check
- Winsock Info
- Network Adapter Address