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A browser-based graphing calculator tool. The interface is similar to Grapher for Mac. It is an easy-to-use, free alternative to expensive graphing calculators. There is also an app version of Demos for the iPad.

Upload or enter data and create attractive, interactive graphs. Publically share graphs and data with others. APIs available for Matlab, Python, and R.

For Windows computers - Free and open-source software for creating two-way and three-way Venn diagrams.

A browser based tool to create up to four-way Venn diagrams from lists of numbers.

For Windows, Mac, and Linux. Free and open-source software for creating diagrams and concept maps. It is more flexible/free-form than yEd, making it great for qualitative research or mind maps.

yEd is a powerful desktop application that can be used to quickly and effectively generate high-quality diagrams.
Create diagrams manually, or import your external data for analysis. Our automatic layout algorithms arrange even large data sets with just the press of a button.

yEd is freely available and runs on all major platforms: Windows, Unix/Linux, and Mac OS X.

A German site which supports text of any kind, audio, video, and image files. There is a plugin available to use with R, the open source statistical analysis software.

A free version of proprietary software for assisted qualitative analysis software. It can be used for the analysis of textual data such as interview and news transcripts, open-ended responses, etc. as well as for the analysis of still images.

Windows, Mac, and Linux. An R package for Qualitative Data Analysis.

Windows or Mac. A tool for extracting data tables locked inside PDF files.

A semi-automated browser tool to reverse engineer images of data visualizations to extract the underlying data.

A free online OCR tool. Given an image with text, attempts to parse and extract the text. Useful for small-scale text detection.

Convert a set of addresses into a map graph (does not need longitude/latitude info).

Color suggestions specifically for map graphs. Can limit suggestions to only those that are colorblind-safe, print-safe, etc. Color codes can be given as hex, RGB, or CMYK.

Open, socially-sourced map data.

Given a list of addresses, attempts to find the corresponding longitude/latitude (which can be given in decimals or in degrees).

Windows, Mac, Linux, and Android. Open Source Geographic Information System (GIS) licensed under the GNU General Public License. QGIS is an official project of the Open Source Geospatial Foundation (OSGeo). It supports numerous vector, raster, and database formats and functionalities.

Windows, Mac, Linux. free software program that serves as an introduction to spatial data analysis. OpenGeoDa is the cross-platform, open source version

free Geographic Information System (GIS) used for geospatial data management and analysis, image processing, graphics/maps production, spatial modeling, and visualization. GRASS is an official project of the Open Source Geospatial Foundation.