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Monitor color calibration, Monitor color resolution, Create color harmonies, Color delta/comparison math, Color tutorials formulas to calculate color differences. All of them refers to the CIE-L*ab color space.Each formula is written as a "neutral programming function", easy to be translate in any specific computer language.We did not post obvious deltas which involve a simple subtraction of two values.

an online tool to practice math problems.

HTML5 scientific graphing calculator, which millions of students around the world use for free. We also create activities on top of that calculator, helping students use a powerful tool to experience all the curiosity, beauty, and sense that math has to offer. Those activities were used so often by so many teachers around the world that we decided to create an Activity Builder, helping every teacher create digital math activities that equal and exceed the activities we create ourselves. E-LEARNING: We invite students to solve challenging problems using the tools they already have. We create a need for new tools before we help students learn how to use them.

00: Basic Latin, Latin 1 01: Latin ext A, Latin ext B 02: Latin ext B cont, ... 03: Diacrit, Greek, Coptic 04: Cyrillic 05: Cyrillic Supp., Armenian, Hebrew 06: Arabic 07: Syriac, Thaana 09: Devanagari, Bengali 0A: Gurmukhi, Gujarati 0B: Oriya, Tamil 0C: Telugu, Kannada 0D: Malayalam, Sinhala 0E: Thai, Lao 0F: Tibetan 10: Mayanmar, Georgian 11: Hangul Jamo 12: Ethiopic 13: Ethiopic, Cherokee 17: Tagalog,Hanunoo,Buhid,Tagbanwa,Khmer 18: Mongolian 19: Limbu, Tai Le, Khmer Symbols 1D: Phonetic Extensions 1E: Latin Extended Additional 1F: Greek Extended 20: Punctuation,Sub/Superscripts,Currency 21: Letterlike Syms, Number Forms, Arrows 22: Mathematical Operators 23: Misc. Technical 24: Ctl Picts, OCR, Encl Alphanumerics 25: Box Drawing, Block Elem, Geom Shapes 26: Misc Symbols 27: Dingbats,Misc.Math-A,Supp.Arrows-A 28: Braille 29: Suppl. Arrows-B, Misc.Math.Symbols-B 2A: Supplemental Mathematical Operators 2B: Miscellaneous Symbols and Arrows 2E: CJK Radicals Supplement 2F: Kanji Radicals,Ideographic DescChars 30: CJK Syms+Punct, Hiragana, Katakana 31: Bopomofo, Hangul Compat Jamo, ... 32: Enclosed CJK Letters and Months 33: CJK Compatibility 34: CJK Unified Ideographs Extension A 4D: Yijing Hexagram Symbols 4E: CJK Unified Ideographs (start) 9F: CJK Unified Ideographs (end) A0: Yi Syllables (start) A4: Yi Syllables (end), Yi Radicals AC: Hangul Syllables (start) D7: Hangul Syllables (end) D8: High Surrogates (start) DB: High Surrogates (end), DC: Low Surrogates (start) DF: Low Surrogates (end) E0: Private Use Area (start) F8: Private Use Area (end) F9: CJK Compatibility Ideographs FA: CJK Compatibility Ideographs (cont) FB: Alpha Pres Fms,Arabic Pres Fms A(st) FD: Arabic Presentation Forms-A (end) FF: Halfwidth+Fullwidth Forms, Specials

LibreOffice is the power-packed free, libre and open source personal productivity suite for Windows, Macintosh and GNU/Linux, that gives you six feature-rich applications for all your document production and data processing needs: Writer, Calc, Impress, Draw, Math and Base. Support and documentation is free from our large, dedicated community of users, contributors and developers. You, too, can get involved!

# 7Z BZ2 BZA CAB GZ LHA LZH RAR TAR TGZ YZ1 ZIP 3GP (in/out) AMV (out) ASF (in) AVI (in/out) DV (in) FLI (in) FLV (in) MKV (in) MOV (in/out) MP4 (in/out) MPG (in/out) OGM (in) SWF (out) VOB (in) WMV (in) # AVS BMP CIN DCX DIB DPX FITS GIF ICO JFIF JIF JPE JPEG JPG MIFF OTB P7 PALM PAM PBM PCD PCDS PCL PCX PGM PICT PNG PNM PPM PSD RAS SGI SUN TGA TIF TIFF WMF XBM XPM YUV and # Raw text, HTML, XHTML, Microsoft Word, RTF, PDF, PS, Open Office, Star Writer, Pocket Word, Word Perfect # CSV, dBase, Microsoft Excel, Pocket Excel, Lotus 123, Quattro Pro, Star Calc, Open Office spreadsheet # MathML, Star Math, Open Office math # Microsoft Powerpoint, Star Impress, Open Office presentation

whiteboard that users can share online in real-time

Wiky is a clientside Wiki markup to HTML converter written in javascript. As it is bidirectional, it can convert Wiki markup to HTML and later convert that generated HTML text back to Wiki markup. Optionally Wiky will create math formulas from a simple notation similar to LaTeX.

true random number generators

Pandoc is a program for converting between various markup formats. Input formats include markdown, reStructuredText, HTML, and LaTeX; output formats include HTML, LaTeX, ConTeXt, S5, DocBook, groff man, reStructuredText, markdown, and RTF. Many extensions to standard markdown syntax are provided, including inline LaTeX math, tables, definition lists, superscripts and subscripts, smart quotes and dashes, and footnotes Pandoc is in the MacPorts, Debian, Ubuntu, Slackware, Arch, NetBSD, and FreeBSD ports repositories. Note that the version of pandoc in these repositories may not be the most recent. There is also a Windows installer.

I strive to build calculators and content useful for academic and real world applications that are easy to use online.  If you have an idea for a calculator that you would like to have to use online, please let me know. Requests for an online calculator.

"Here you can plot functions, functions in polar coordinates, and parametric equations."

nice tool to create, help visualise mathematical problems

Search Wikipedia and FormulaSheet for formulas. Instantly get the image or copy the formula to LaTeX or MS Word 2007+ as MathML. Upload your LaTeX file with a single click. We will find and extract all of your formulas.Create formulas from scratch using our intuitive equation editor. Add a title and description to your formula; give it tags so that you can find it again later.

Fractal Lab - Interactive WebGL fractal explorer. However, WebGL is currently officially supported and enabled by default on the very latest Google Chrome and Firefox 4 beta browsers. You can also enable it on WebKit nightly builds too.

OPML code generator for del.icio.us, Simpy, Connotea, CiteULike and/or Scuttle RSS feeds, with options for URL structures (used by del.ico.us, Connotea and Scuttle) username and tags.