HEATKEYS

Draw, share and collaborate on online diagrams. Easy web flow chart, network diagram, mockup, wireframe, UML diagrams like Class, Sequence, & data flow and process flow diagrams. Creately - free web-based software for online diagram software

DFD, free download. DFD 1.1: A simple flowchart editor and interpreter.

Edraw is a powerful yet easy-to-use program for creating flowcharts, organizational charts, network diagrams, business presentations, building plans, mind mapping and lots more.

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UML design and business analysis tool for modeling, documenting, reverse engineering, building and maintaining object-oriented software systems, fast and intuitive. Great features, great price.

Software development tools support UML, SysML, BPMN, Business Rule, ERD and mind mapping. All Visual Paradigm tool can run on Windows, Linux and Mac OSX.

SourceForge.net. Fast, secure and free downloads from the largest Open Source applications and software directory

Providing researchers with access to millions of scientific documents from journals, books, series, protocols and reference works.

Help and support for all Office products: Word, Excel, PowerPoint, OneNote, Outlook. Set up and manage your office subscription, find how-to articles, get free training, video demos, and tutorials.