A tag is a keyword or label that categorizes your question with other, similar questions. Using the right tags makes it easier for others to find and answer your question.

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Software to run on the Microsoft Windows family of operating systems.
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Software free of financial cost. For software that includes the source code, [open-source] is the best tag. Software can be either [gratis] or [open-source], or both. Only use this tag if "gratis" is…
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Software to run on, or interact with, the Android operating system. For non-recommendation questions, please ask on android.stackexchange.com, or stackoverflow.com for programming Android applications…
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Software to run on the Linux operating system.
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Software required to be open-source. This is not to be confused with "gratis" software, which is free of cost. Open-source, sometimes called "free" or "libre" software, has the original source code fr…
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Software that has a user interface appearing in a web browser. These applications may run on third-party servers or be self-hosted.
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Software requests regarding python programming language, Python IDE's, and Python development tools.
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Code libraries to write programs to accomplish specific tasks. Please use this tag together with one for the associated programming language.
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JavaScript libraries, frameworks, plugins and JavaScript software development tools
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Java development tools and libraries for Java.
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Software for a database or an application related to one or more databases . For specific databases, please use the specific tag (see wiki).
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Software tools used during the development of other software.
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Software that manipulates PDF (Portable Document Format) files: converting to or from PDF, printing, editing, assembling or splitting, …
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Software to run on Apple's OS X operating system.
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Software related to the C++ programming language, including development environments, editors, compilers, analyzers, and libraries.
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Software to create or manipulate video files.
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Tools used during the development of web-apps or websites.
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Software related to HTML, the main markup language used in the creation of web pages.
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Software specifically for Windows 7. Please tag with [windows] instead unless your question involves functions specific to Windows 7.
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Software to run on the iOS operating system series developed and sold by Apple Inc. For questions involving Apple hardware, software, and services see also apple.stackexchange.com. For general compute…
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Software for handling images and graphics, including creating, editing, converting, organizing, and printing.
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Libraries in C# and software to develop C# programs. C# is an object-oriented programming language developed by Microsoft within its .NET Framework.
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Integrated development environments (IDEs) for, libraries to use with, or products based upon the PHP language.
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Software to create, read, record, or modify audio.
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Software to manage files stored on device(s), network(s), and/or in the cloud.
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if one of the software requirements is an Application Programming Interface (API), e.g. besides a graphical user interface (GUI), commandline interface (CLI) or web interface.
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Software to perform actions by itself without actively being supervised by a user.
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web browser software and web browser add-ons. If you are specifically looking for a Firefox or Chrome add-on/extension/plugin, use the tag [firefox] or [chrome] instead.
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Software to read/write/manage emails (client-side), or to process them (server-side).
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Software specifically for Windows 10. Please tag with [windows] instead unless your question involves functions specific to Windows 10.
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Extensions or programs that work with Google's Chrome web browser.
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Software that interacts with a network of computers or other devices.
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Questions seeking recommendations which have a graphical user interface (CLI) and where a command-line interface (CLI) answer would be obvious but does not satisfy your needs.
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Software to edit text. Also consider the `html-editor` tag, if appropriate.
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a feature of software that brings hard to comprehend information into an optical representation that can be human-readable.
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For requests for recommendations of security software. Before using this tag, make sure there's no more specific tag for the software you're after.