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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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in addition to the 'linux' tag for questions where integration in the default Ubuntu interface is a requirement. If you're just looking for Linux software and happen to be running Ubuntu,…
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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.
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programs that manipulate, enhance, or convert images
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Software to perform actions by itself without actively being supervised by a user.
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Software for music playback and musical performance. Media players and media libraries are included.
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if you look for software to be used on the command-line or in shell scripts.
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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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Recommendations for applications, extensions, and plugins related to Mozilla's Firefox web browser.
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when asking for software related to an Integrated Development Environment.
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the general tag for programs that allow manipulation, categorization and all other interactions with photographs.
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if you're looking for a library or program written in C, or software that consumes or produces C source code.
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A software development framework developed by Microsoft that runs primarily on the Microsoft Windows family of operating systems with support on Linux through Mono.
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a platform used to build websites that are easily edited by multiple users.
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Taking written notes. Notes can include free-form text, sketches, and lists.
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Software to aid in the editing and post-processing of video.
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when asking for software that needs to run on multiple platforms.
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the act of looking on the processes or systems for performance, supervision and surveillance.
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when seeking software recommendations to relay instant text messages over the Internet, either between individual or to a private or public group.
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A collection of common functions, that enable the programmer in a consistent way, to have common tasks handled automatically. Combine with a language tag.
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if you require the software to support encryption.
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Software to display days, weeks, months, years, and the like. Most let you interact with the calendar to show appointments or similar information.
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Requests for applications or tools for the efficient use and control of the time in specific tasks or activities with the purpose of raising productivity
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Software that creates and/or interacts with graphs
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File synchronization covers the synchronization of files between two devices or between a device and server or cloud service.
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to be used for questions asking for recommendations for proper document management systems (DMS).
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Where teams work together at one task, e.g. the same document or code, the piece of software used must be able handling that. Use this tag if that's a requirement to the software you're looking for.
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for software (typically Web apps) running on a server you control
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an attribute of a tool (most likely a web-app) that allows interacting with a service (e.G. storage, calculation etc.) that is hosted on external machines.
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For software (plugins etc.) that needs to work with WordPress, the PHP-based content management system.
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An iOS app specifically directed to iPhones
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Generic software that displays multimedia content. Combine with "video", "audio" or other appropriate tag that makes clear what media you want to play.
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Software to display, search, or otherwise process geographical maps
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when seeking software recommendations that relate to testing software for bug discovery and removal, application reliability, interface responsiveness, throughput speed, or other developm…
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explicitly for the MySQL database (server or client). Targeting "any" database, rather use the 'database' tag.