Open Source Calculators

GraphCalc is a very gui graphing calculator. It has been called a good replacement for a TI-85. It is a must for any high school math student.

Gordian Knot started out as a simple bitrate calculator for DivX encoding but has evolved to become an integrated package or tool for the entire process of DivX/XviD encoding.

A powerfull tool to work with math functions. At this stage of progress it's draw 2D graphs and 3D graphs of any function. Also have very easy to use calculator which can calculate complicate expressions.

Bitrate calculator free and open source GNU/GPL by philippe734. Inspired from the bitrate calculator of MeGUI but in a stand alone version. No need MeGUI and no need microsoft framework. Developped by philippe734, author of VPN Lifeguard.

A python-based calculator that uses the Sabine, Norris-Eyring and Fitzroy formulae to calculate the RT60 time of a room with given specifications. Material list from SAE Institute reference.

Calculate the Beats Per Minute of a song! Just tap for a chosen time on a button & hit the calculate button!

The Forestry Commission and Natural England commissioned a bespoke data collection and presentation tool for calculating the potential for increasing the extent of tree cover across the north west of England. The data was divided into sub-regions by landscape type using Natural England's Character Area classifications. The potential within each of these Character Areas was then estimated by working groups of local experts who were capable of making reasoned assessments of both the opportunities and constraints to woodland creation. Subsequently, this project was considerably extended and adopted as a national system. It is currently being used to compile the National Woodland Potential dataset for the whole of England.

A program that builds the sounds of the chord from its name. The chord building rules are applied with the respect to the requirements of music theory. The user interface is based on the WT library (c++ web toolkit).

BitMe is a DivX bitrate, file size, and data rate calculator; although it can be used with other MPEG-4 codecs as well. Future versions will support more codecs.

Bitcalc is a simple bitrate calculator. It'll help while creating DVD rip.

BitrateCompressionCalculator for Python (BCCpy) is a very simple application for calculating a file size from length and bitrate. BCCpy came about as the result of my beginning to learn Python and recreating the basic functionality of a simple VB program I wrote back in 1999. Since I was never very proficient with Visual Basic (or Applesoft BASIC for that matter); this application is very basic and could use lots of improvements. I'll implement them as I learn them. As of October 6, 2018; I have "abandoned" the project. I have actually forgotten everything I know about Python since writing this and other than adding error handlers; I really don't know how much further I could take it. I wanted to build a simple calculator, and I did.

Calculator with 3D interface

A really simple Mac OS X program that performs the calculation to obtain the number of cicero's from a giving number of points. Thought to be for Design. Jaime Rodríguez, 2010. The source code is for Xcode 3, Intel versions can be compiled but not

This program is designed for phtographer who need to know different DoF in each apertures under fixed environment factors. It is a one-page calculator. Just input the film/sensor size and focal length of lens, DoF of each different aperture will be calculated and presentated.

The Film Stock Calculator is an application for calculating the film stock footage and cost for a film.

The Fung-Calc is an advanced, yet easy to use graphing calculator that supports graphing in both 2D and 3D. Several different plot types are available and graphs can be animated.

A PHP program that graphs in y= format. GD graphics library needed.

This is a Java Just Intonation Calculator. It allows users on many platforms to calculate and hear just tunings. It will support saving and opening tunigs and opening spreadsheet documents and allow users to send tunings to their synthesizers, via MIDI

C# Website system. This is going to be the "Newer" Internet, and even has a custom theme system. This is going to let users do "anything" that won't harm the client computer in any way.

This program turns an ordinary TI-86 calculator into a shutter release trigger for some Canon (and possibly many other) cameras using nothing more than a data-link cable. Future versions will include self-timer, interval, and long exposure modes.

Yet another video ripping calculator, which tries to take into account container format overheads as accurately as possible, for multiple audio and video codecs, and suggest optimum encoding resolutions, with correct aspect ratio calculations.

Video bitrate calculator to provide quick calculation of bitrates for multimedia files for optimizing quality and filesize. PHP and X11/QT versions available.

Zwicker's Loudness Calculation (ISO532B) Tools. The project includes a loudness calculation program based on Zwicker's Method, and a WAV file analyzer generating data files for loudness calculation. Documentation and test files are also provided.

A "bitwise precision tool" bitrate calculator using MS-EXCELL programming. The results are used for DVD Video to audio-video streams. It helps compute VIDEO- & AUDIO-Bitrates, aspect ratio, screen size, choose audio format cbr. Has units MB,pixel,d:h:m:s, kbps, etc

We are going to make a multipurpose librairy for the Texas instrument 68k calculator (TI-89 & TI-92+) We are planning to add optimized graphic routine, and a lot more... Grayscale graphic will be added too, of course :)