Apps to Customizable Interface

IINA is a modern, free, and open-source media player designed exclusively for macOS, built upon the powerful mpv playback engine. It offers a stunning user interface, a comprehensive feature set, and seamless integration with macOS.

Songbird was a feature-rich, open-source media player and web browser aimed at music enthusiasts. It offered a unique blend of music discovery, management, and playback functionalities, with extensive customization options through add-ons. Key features included music library management, playlist creation, syncing capabilities for various devices, and integrated web browsing for exploring music-related content.

Mozilla Firefox is a powerful, open-source web browser developed by the not-for-profit Mozilla Foundation. Known for its strong focus on user privacy and customization, Firefox offers a fast and secure browsing experience across multiple platforms, supported by a vast ecosystem of extensions.

VLC Media Player is a free and open-source cross-platform multimedia player that plays most multimedia files as well as DVDs, Audio CDs, VCDs, and various streaming protocols. Known for its robust format support and stability, VLC is a favorite for playing virtually any media file without the need for external codecs.

Calligra Stage, formerly known as KPresenter, is a free and open-source presentation software designed for creating compelling slideshows with a focus on flexibility and compatibility.

Noise is a sleek and efficient GTK3 audio player designed for managing and enjoying your music library. It prioritizes speed and a clean interface, offering essential features for music enthusiasts who value performance and simplicity.

Eric is a powerful, feature-rich integrated development environment (IDE) primarily designed for Python and Ruby development. Written in Python, it offers extensive capabilities for code editing, debugging, project management, and more, making it suitable for developers of all levels.

Lumina Desktop Environment is a lightweight and highly customizable desktop environment focused on performance and user control. It's designed to be simple, efficient, and extensible through plugins, offering a seamless experience primarily on BSD operating systems but adaptable to others.

Scratch is a powerful yet lightweight text editor designed for developers and anyone working with code or plain text. It offers automatic saving, syntax highlighting, and a range of features to boost productivity, all within a customizable and extensible interface.

Griffith is a discontinued, but functional, media collection manager designed to help users catalog and organize their collections of movies, films, and other video media. It provides a database-driven approach to library management, allowing for detailed information tracking and categorization.

LazPaint is a lightweight, portable raster image editor designed for simplicity while offering essential features like layers and various photo effects. It aims to be an accessible alternative to more complex software, making image editing approachable for users seeking a less overwhelming experience.

Finch is a versatile, command-line based instant messaging client that leverages the Pidgin network libraries. It supports multiple protocols like AIM, Jabber, MSN, Yahoo!, IRC, and more, providing a text-only interface for users who prefer the efficiency and minimalism of the console environment.

Kadu is a free, open-source, multi-platform instant messaging client supporting Gadu-Gadu, XMPP, and related services like Google Talk, providing users with a versatile and extensible communication tool.

Denemo is a robust free software graphical user interface (GUI) designed for efficient music notation, primarily acting as a front-end for the powerful GNU LilyPond music engraver. It allows musicians and composers to create high-quality musical scores.

musikCube is a lightweight, partially open-source terminal-based audio player designed for managing and playing large music libraries efficiently. It offers advanced features like smart playlists, plugin support, and internet radio streaming.

ScreenToGif is a free and open-source application designed for recording your screen, editing the captures, and saving them as GIF or video files. It's portable and packed with features for creating animated visuals.

Psi+ is a robust, cross-platform XMPP/Jabber client tailored for users who prioritize control, privacy, and extensibility. As a development branch of the classic Psi client, it offers advanced features for secure and customizable instant messaging.

Open Atrium is a powerful open-source collaboration and project management platform built on Drupal. It provides a modular framework to create customized intranets, team sites, and project workspaces, facilitating communication, document sharing, task management, and more within organizations.

PCMan File Manager is a highly regarded, lightweight file manager designed for speed and efficiency. It is the default file manager for the LXDE desktop environment and offers a clean interface and essential file management functionalities with low resource consumption.

Geeqie is a blazingly fast and extremely customizable Gtk+ based image viewer designed for Unix-like operating systems. It excels at efficient photo browsing, organization, and basic editing, making it an ideal tool for photographers and anyone dealing with large image collections.

Enlightenment is a highly customizable and lightweight window manager and desktop environment. It's known for its performance efficiency and aesthetic flexibility, offering a modular platform for users seeking a departure from traditional desktop experiences.

Nightingale is a highly customizable cross-platform audio player with a focus on extensibility, featuring a beautiful interface, a wide array of supported formats, and tools like media library management, podcast playback, and integrated web browsing.

LineageOS is a free and open-source Android-based operating system designed for smartphones and tablets, offering enhanced privacy, security, and customization options over standard manufacturer ROMs.

Cool Reader is a highly configurable and lightweight eBook viewer designed for comfortable reading on various devices. It supports multiple formats including EPUB and DOCBOOK, offers extensive customization options for interface and reading experience, and includes useful features like library management, annotations, and sync capabilities.

gmusicbrowser is a highly customizable, open-source music player and library manager designed for users with large audio collections. It offers a range of advanced features including intelligent playlists, flexible tagging, and extensive interface customization, making it a powerful alternative to mainstream music players.

CubicExplorer is a feature-rich file manager designed as a replacement for Windows Explorer, offering tabbed browsing, dual-pane support, built-in tools like a text editor and file preview, and extensive customization options for enhanced file management.

Comix is a lightweight and efficient image viewer designed specifically for reading comic books and manga. It supports popular archive formats like ZIP, RAR, and tar, providing a seamless experience for digital comic enthusiasts on Linux systems.

Bloodshed Dev-C++ was a robust free IDE for C and C++ programming in Windows. It provided a complete development environment with compiler, debugger, and editor, commonly used by students and enthusiasts.

LibreCAD is a robust and free 2D CAD application supporting multiple operating systems. It offers essential tools for technical drawing and design, making it an excellent choice for individuals and businesses seeking a cost-effective yet capable CAD solution.

Karbon is a free and open-source vector graphics editor, part of the Calligra Suite. It enables artists and designers to create scalable vector artwork, illustrations, and graphics, supporting various features like layers, vector tracing, and export options.