Open Source Calculators

CRC RevEng is a portable, arbitrary-precision CRC calculator and algorithm finder. It calculates CRCs using any of the 113 preset algorithms, or a user-specified algorithm to any width. It calculates reversed CRCs to give the bit pattern that produces a desired forward CRC. CRC RevEng also reverse-engineers any CRC algorithm from sufficient correctly formatted message-CRC pairs and optional known parameters. It comprises powerful input interpretation options. Compliant with Ross Williams' Rocksoft(tm) model of parametrised CRC algorithms.

This emulator is capable of providing a faithful replication of the HP48. It also has a debugger for the saturn processor.

TRURL is a suite of desktop calculators with reverse Polish notation (RPN) written in Object Pascal. Additionally, it comes with a free reusable class library (RPN Engine) as a toolbox for creating your own calculator. TRURL is an acronym for "TRURL is a Reusable Universal RPN Library". Class Libraries: • RPN Engine: Full-featured calculation engine for Pascal-based RPN calculators • Segmitator: Library for virtual seven-segment displays Applications: • TRURL A: Simple demo app for the RPN Engine • TRURL B: RPN calculator in the design of the famous calculators by Dieter Rahms for Braun • TRURL G: Desktop RPN calculator inspired by the UI of the DSKY unit of the Apollo Guidance Computer (AGC)

HexTool is a simple yet effective calculator/tool; invaluable for people who work with Hex and Binary. Now you can convert between Hex, Binary and Decimal on the fly. No install needed: just unzip and run it!

BigAl is a free open source and platform independent software for calculating really BIG numbers. It supports not only standard arithmetic, but also exact period determination, predefined factorials, fibonacci with seeds, factorization, nth root, etc

sCal: a small, scientific, script programmable calculator--for & in JavaScript. sCal2: an expansion giving a function/program catalog system with: hundreds of unit-conversions & material properties, programming examples, nearly limitless user-procedures

Arbitrary Precision Calculator a Qt-based user interface to the Calc library “Calc - C-style arbitrary precision calculator” (2.12.2.2 with fixes up to 2.12.4.3) by Landon Curt Noll et. al. http://isthe.com/chongo/tech/comp/calc/ and also https://sourceforge.net/projects/calc/ This project owes an enormous debt of gratitude to Landon.

ASM68000 is a usefull editor to write ASM code for TI89 calculator. It is a simple IDE written in TCL/TK, so it works with the TCL/TK interpreter. You can found it at the adress www.sun.com/960710/cover/dltcl.html. I hope it will help you in your ASM prog

Canyon is a date calculator utility that aims to provide handy methods to perform arithmetic calculations on java.util.Date objects. Developers are free to plug in their own localized instances of java.util.Calendar or to use the default GregorianCalenda

Pure-Java cryptographic calculator, featuring basic arithmetic operators, cryptographic operations, multiple key file formats and edition of ASN.1 object files.

Emulator of the newer Hewlett Packard Handheld Calculator Models with ARM CPU (HP49g+ HP50).

Java KellyCriterion Calculator

OntoMetriCalc (Ontology Metrics Calculator) is a Java API for measuring OWL ontologies based on Jena.

Small-K (Small Calculator) is a command line based mathematical expression evaluating engine in C. It supports symbolical extension in the forms of math functions with arbitrary number of arguments (e.g. f(1, 3)) and variables (e.g. PI).

SolCalc is a free Java based scientific calculator that can run as a swing/awt application or as an applet on any servlet container. The package contains the full java source codes. SolCalc is also platform independent, hence it can run on Windows, Linux

latexcalc is a "LaTeX Calculator" that calculates values inside your LaTeX files before typesetting them. More accurately, it preprocesses files written in a superset of the LaTeX typesetting language and evaluates specified expressions in the text.