Open-Source Workout and Fitness Apps

Workout-Cool is a self-hosted fitness application that combines an exercise database browser, workout plan builder, and progress tracking dashboard into a single coaching platform. The application runs on personal infrastructure with full code access, storing workout data locally in the browser while offering optional account-based synchronization for continuity across sessions. The platform provides a searchable exercise library with detailed instructions and video demonstrations, along with pre-built workout programs that can be filtered by difficulty, duration, and equipment requirements.

wger is an open-source web application for fitness tracking, workout planning, and nutrition management. It provides a self-hosted platform where users can design weekly workout routines from a built-in exercise library, log their training progress, and plan daily meals using a food database with automatic nutritional calculations. The application supports multi-user accounts with credential-based login, passkey authentication, and third-party sign-in through OAuth providers. The platform includes a documented REST API that enables programmatic access to workout logs, meal plans, and user dat

GarminDB is a local fitness data store and self-hosted health data archive designed to import, archive, and analyze health and activity metrics from Garmin accounts. It functions as a fitness data aggregator and metric analysis tool, maintaining a private database of health records for independent tracking and custom querying. The system features a GPS activity heatmap generator to visualize frequently traveled paths and a plugin system for integrating specialized third-party data fields and custom metrics. It employs a local-first persistence model that retains original source files on disk

Pygwalker is a library that transforms tabular data into interactive, drag-and-drop interfaces for exploratory analysis and visualization. It functions as a grammar-based framework that translates user interactions into declarative chart definitions, allowing for the creation of dynamic data exploration environments directly within notebooks or embedded web applications. The system distinguishes itself by offloading heavy analytical computations to backend kernels, which maintains responsiveness when visualizing large datasets. It supports the serialization of visual states into portable conf

Gadgetbridge is an open-source Android wearable device manager and health tracker. It enables users to connect and manage smartwatches and fitness trackers without requiring vendor cloud accounts or proprietary companion software. This cloudless framework prioritizes privacy by storing all health and activity data locally on the mobile device. It functions as an alternative to proprietary apps by removing the need for vendor-managed cloud services to synchronize device data. The application provides a system for device management and health tracking, utilizing a modular driver system to supp

vis is a JavaScript data visualization library used to render interactive networks, timelines, and graphs directly in the web browser. It functions as a relational data mapper and browser-based charting tool, turning complex structured data into dynamic visual patterns to expose entity relationships. The library provides specialized tools for force-directed network graphs, where relational data is represented as interactive nodes and edges. It also includes an interactive timeline component for plotting chronological events and time intervals on a scalable temporal axis. The project covers b

vx is a declarative charting framework and SVG data visualization library. It serves as an integration layer that combines D3 mathematical scales and shapes with a component-based UI for rendering visualizations. The project provides a set of building blocks for constructing custom charts and diagrams using React components. It bridges mathematical data and visual representation by utilizing low-level primitives to manage scalable vector graphics without manual document object model manipulations. The library covers a broad capability surface including custom chart development, declarative S

Apache ECharts is a JavaScript data visualization library used for rendering interactive charts and complex data visualizations in web browsers. It functions as a canvas-based charting engine and a statistical data visualization suite that transforms datasets into visual representations. The framework provides specialized capabilities for three-dimensional data visualization, including the generation of 3D plots and globe visualizations. It also serves as a web-based geographic mapping tool for overlaying heatmaps, routes, and data distributions onto interactive maps. The library covers a br

Perspective is a columnar data analytics library and streaming data visualization engine. It provides an interactive data grid component and notebook analytics widgets designed for processing high-volume data and rendering interactive charts and grids. The system utilizes a high-performance query engine to enable real-time data analysis and streaming dataset visualization. It supports the creation of customizable dashboards and reports that update automatically as new data arrives without requiring full dataset reloads. The project covers large-scale dataset analytics through a schema-driven

This project provides a collection of reusable UI components for rendering interactive, data-driven charts within web applications. It functions as a bridge between the framework's component-based architecture and low-level graphics libraries, allowing developers to encapsulate complex visualization logic into standard elements. The library distinguishes itself by integrating reactive data binding and lifecycle management directly into the charting process. This ensures that visual representations, such as bar, line, and pie charts, automatically synchronize with underlying data models and ad

ChartView is a SwiftUI-native charting library that provides bar, line, pie, and ring chart components within a unified grid-based layout system. The library renders charts by composing SwiftUI views declaratively from data models, letting the framework handle layout and updates without intermediate drawing layers. The library supports multiple chart types that share a common grid layout, enabling composable data visualizations with synchronized axes and backgrounds. Bar charts display data as vertical bars, line charts plot connected data points with gradient fills and optional markers, pie

gpui-component is a native desktop UI kit and component library built for the GPUI framework. It provides a collection of reusable user interface elements, a desktop layout engine for organizing application space, and a specialized data visualization library for rendering quantitative information. The project is distinguished by its high-performance rendering systems, including a virtualized data grid and list system designed to handle large datasets with low memory overhead. It also features a comprehensive data visualization toolkit for rendering charts, axes, and coordinate scales using li