--- title: Best It's Foss posts — December 2021 | daily.dev description: The most upvoted It's Foss posts from December 2021, curated by the daily.dev community. canonical: https://daily.dev/sources/itsfoss/best-of/2021/12 twitter:card: summary_large_image twitter:site: @dailydotdev og:url: https://daily.dev/sources/itsfoss/best-of/2021/12 og:type: website og:site_name: daily.dev og:title: Best It's Foss posts — December 2021 | daily.dev og:description: The most upvoted It's Foss posts from December 2021, curated by the daily.dev community. og:image: https://media.daily.dev/image/upload/s--VAY5ToZt--/f_auto/v1724209435/public/daily.dev%20-%20open%20graph --- # Best of It's Foss — December 2021 1. 1 [](https://daily.dev/posts/gaphor-open-source-graphical-modeling-tool-qiu-2komr "Gaphor: Open Source Graphical Modeling Tool") Article It's Foss·5y Gaphor: Open Source Graphical Modeling Tool Gaphor is a free and open source modeling application with support for various modeling languages such as UML, SysML, RAAML and C4\. It is a cross-platform tool and available to install on Linux, Windows and macOS. You can export your diagrams in PDF, PNG, SVG and XML formats. 142 5 2. 2 [](https://daily.dev/posts/19-absolute-simple-things-about-linux-terminal-every-ubuntu-user-should-know-norons0pk "19 Absolute Simple Things About Linux Terminal Every Ubuntu User Should Know") Article It's Foss·5y 19 Absolute Simple Things About Linux Terminal Every Ubuntu User Should Know Terminal often intimidates new users but once you get to know it, you gradually start liking it. This article focuses on explaining small, basic and often ignored things about using the terminal. This should help new Ubuntu desktop users to know the terminal and use it with slightly more efficiency. 68 7 3. 3 [](https://daily.dev/posts/what-is-tty-in-linux--szrkf0cl3 "What is TTY in Linux?") Article It's Foss·5y What is TTY in Linux? The term ‘TTY’ is an abstract device in UNIX and Linux. Sometimes it refers to physical input device such as a serial port, and sometimes to a virtual TTY where it allows users to interact with the system. TTY is a subsystem in Linux and Unix that makes process management, line editing and the kernel level possible. 18 4. 4 [](https://daily.dev/posts/why-folders-are-called-directory-in-linux--urghwlrwo "Why Folders are Called Directory in Linux?") Article It's Foss·5y Why Folders are Called Directory in Linux? When you start using computers with Windows, you are likely to use the term folder. When you switch to Linux, you’ll find that folders are often termed as directory. This may confuse some new Linux users. Should you call it folder or directory? 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