Open-source alternatives to Spark

tui-rs is a Rust framework for building rich terminal user interfaces and dashboards. It provides a terminal layout engine for dividing the screen into flexible rectangular regions and a widget library for rendering data in a terminal. The project includes a cross-platform terminal backend abstraction layer to ensure consistent rendering and compatibility across different operating system terminal drivers. The framework covers a wide range of UI components, including data visualization tools such as charts, progress gauges, and sparklines, as well as structural elements like data tables, ite

usql is a universal SQL command-line interface used to connect to and manage multiple SQL and NoSQL databases through a single unified tool. It provides a standardized interface for executing queries across various data stores and serves as a multi-database query tool and schema inspector. The tool distinguishes itself by enabling cross-database data migration, allowing users to pipe result sets from one active database connection directly into another. It also features terminal-based data visualization, which renders query results as graphical charts, graphs, and images directly within the t

A charting tool that produces automatic, shareable charts from any data file

Visual Insights is an automated exploratory data analysis platform and causal inference tool designed to discover patterns and cause-and-effect relationships within datasets. It functions as an interactive data visualization library using a grammar-of-graphics approach to generate multi-dimensional charts and dashboards. The project distinguishes itself through a natural language interface that translates plain-text questions into data answers and visualizations via a language model. It provides a specialized framework for causal discovery and inference, allowing users to identify variable li

Gephi is an open-source desktop application for visualizing and analyzing large-scale network graphs. It provides an interactive platform for exploring complex relational data, combining hardware-accelerated rendering with real-time layout controls and a plugin-based modular architecture. The platform distinguishes itself through its ability to handle networks of up to 100,000 nodes and 1,000,000 edges using a custom OpenGL rendering engine, enabling smooth real-time interaction. It includes a force-directed layout engine with real-time adjustment, a dynamic filter pipeline for selecting node

Mermaid is a text-to-diagram rendering engine that transforms markdown-inspired text definitions into visual flowcharts, sequence diagrams, and Gantt charts. It functions as a markdown-based diagramming tool designed to keep technical documentation synchronized with development by defining visuals as plain text. The engine utilizes a sandboxed rendering process, executing diagram generation inside isolated frames to prevent malicious scripts embedded in user text from executing in the browser. The system handles client-side text transformation and domain-specific language parsing to map text

VisiData is a terminal-based interactive data analysis tool and browser designed for exploring, filtering, and sorting large tabular datasets. It functions as a structured data inspector that loads and flattens complex formats like JSON, XML, and PCAP into interactive sheets, as well as a terminal file manager for navigating directories and performing staged filesystem operations. The project distinguishes itself by rendering data visualizations, such as scatter plots and histograms, directly in the terminal using Unicode Braille characters. It provides a Python-based data wrangling environme

Tablewriter is a Go library and tool for generating ASCII and Unicode tables from structured data. It functions as a multi-format table renderer, converting data into layouts for terminal output, Markdown, HTML, and SVG. The project distinguishes itself through the ability to embed nested tables within cells and merge adjacent cells horizontally or vertically. It also supports ANSI color application for headers, rows, and borders to style terminal user interfaces. The toolkit provides capabilities for mapping Go structs and slices into rows, loading and converting CSV files via a command-lin

Onefetch is a suite of specialized command-line tools designed to fetch system specifications, analyze Git repository metadata, and visualize this data in the terminal. It functions as a system information fetcher and a Git repository information tool, providing a concise overview of hardware, operating system details, and project-level statistics. The project distinguishes itself through a terminal visualizer that utilizes ASCII art, Nerd Font icons, and support for Sixel, Kitty, and iTerm image protocols. It includes a dedicated Git churn analyzer to identify frequently modified files and a

Termgraph is a terminal data visualization library and command line analytics tool used to render bar charts, histograms, and heatmaps directly in the shell. It utilizes ANSI escape sequences and Unicode characters to generate colorful visual data representations within a text-based environment. The tool provides specialized capabilities for transforming raw datasets into horizontal or vertical bar graphs, column charts, and stacked charts. It also functions as a heatmap generator, mapping time-series data to a calendar layout to visualize temporal patterns over a year. The library supports

gocui is a console user interface library for the Go programming language. It provides a toolkit for building interactive terminal applications using a layout engine that organizes overlapping rectangular views and coordinates. The library features a terminal input handler to capture and map keyboard shortcuts and mouse events to specific application actions. It includes an ANSI escape sequence parser to manage text attributes, colors, and cursor positioning. The framework covers interface view management and overlapping window layering, allowing for a structured arrangement of content. Rend

TinyOBJLoader is a single-header C++ library designed for parsing Wavefront OBJ files. It functions as a stream-based text parser that extracts vertex, normal, and texture data into structured arrays for use in graphics and physics engines. The project distinguishes itself as a high-performance geometry loader that utilizes multi-threading to distribute the processing of large-scale 3D environments across multiple CPU cores. It includes a mesh triangulator that converts complex polygons into triangles to ensure compatibility with standard graphics hardware. The library supports a variety of

rich-cli is a terminal rich text renderer and data visualizer that transforms raw text and structured data into styled console output. It functions as a command line markup processor, converting Markdown and custom markup into formatted text with clickable links and colors. The tool specializes in terminal content rendering for various formats, including syntax-highlighted source code, JSON data with consistent indentation, and CSV tables. It also supports the rendering of Jupyter notebooks and provides a terminal content pager for navigating long files and remote content via a scrollable int

Rate.sx is a terminal-based financial utility that provides real-time currency conversion and market data access through standard HTTP requests. It functions as a RESTful service designed to deliver financial information directly to command-line environments, allowing users to retrieve exchange rates and perform calculations without leaving their terminal. The service distinguishes itself by offering text-based visualizations of historical exchange rate trends and automated currency conversion through simple query parameters. By mapping numerical data to character-based grid layouts, it enabl

Sampler is a shell command monitoring tool and terminal-based metrics dashboard. It functions as a YAML-configured shell orchestrator that executes commands at set intervals to collect data and monitor system metrics. The tool distinguishes itself by rendering real-time shell output as terminal widgets, such as sparklines, gauges, bar charts, and run charts. It also includes a conditional alerting system that triggers audio notifications, visual alerts, or secondary shell commands when sampled output matches predefined data conditions. The project covers broad capability areas including shel

pterm is a Go terminal UI library used to build rich command-line interfaces. It provides toolsets for terminal data visualization, operation progress tracking, interactive user input, and structured logging. The library distinguishes itself through a comprehensive set of visual tools, including a framework for interactive terminal prompts such as selection menus and confirmation dialogs, and a specialized system for rendering bar charts, heatmaps, and tree structures. It also includes a structured terminal logger capable of producing leveled, colorful system messages. The project covers bro

htmlparser2 is a collection of tools for high-performance markup parsing, DOM manipulation, and incremental stream processing. It functions as an HTML and XML parser that converts markup strings into structured object trees, alongside a streaming markup parser designed for memory-efficient processing of large documents. The project includes a DOM manipulation library for querying, modifying, and serializing document object model trees. It also provides a web feed parser to extract structured metadata and entries from RSS, RDF, and Atom feeds. The library covers broad capabilities in data par

This project is a collection of Go libraries designed to reduce the size of multiple web formats while preserving functional integrity. It serves as a high-performance text processor and multi-format asset compressor for shrinking HTML, CSS, JavaScript, JSON, SVG, and XML files by removing redundant characters. The tool is designed for both static batch processing and real-time use. It includes middleware capabilities to intercept and minify web responses on the fly based on MIME types or file extensions, allowing for content compression during active data streams. The processing suite cover

XlsxWriter is a library for generating spreadsheets in the XLSX format, functioning as an Excel workbook writer and file generator. It provides the capability to write data, apply cell formatting, and build complex layouts across multiple worksheets. The project distinguishes itself with a memory-optimized writing mode that flushes large datasets to disk row-by-row, enabling the creation of files exceeding 4 GB while minimizing RAM consumption. It also includes a specialized mechanism for embedding binary project files and digital signatures to enable VBA macros and signed scripts within work

billboard.js is a JavaScript charting library built on D3.js that renders interactive data visualizations from a single declarative configuration object. It supports a wide range of chart types including bar, line, pie, scatter, area, spline, step, candlestick, funnel, gauge, heatmap, radar, polar, treemap, bubble, donut, and sparkline charts, and can overlay multiple chart types within a single visualization. The library offers an opt-in Canvas rendering mode for improved performance with large datasets and high-density axis displays, alongside its standard SVG-based rendering. The library d

Britecharts is an SVG data visualization toolkit and D3.js charting library. It functions as a composable visualization framework and interactive charting interface used to render data-driven graphics. The library provides a variety of chart types, including line, bar, scatter, donut, sparkline, step, and bullet charts, as well as stacked area and grouped bar charts. It supports interactive elements such as brush interfaces for zooming into date ranges and informational tooltips for data overlays. The framework includes capabilities for visual configuration, such as axis scaling, color schem

Fx is a command-line processing suite designed for the transformation, conversion, exploration, and visualization of structured data. It functions as a terminal-based utility that handles both automated shell pipelines and interactive navigation of complex, nested data hierarchies. The tool distinguishes itself by integrating a JavaScript-based engine that executes user-provided logic to filter, map, or modify data fields within a sandboxed runtime. It maintains a responsive interface by decoupling data processing from the display loop, allowing users to explore large datasets through an inte

vtop is a terminal system monitor and interactive process manager that provides a real-time command line dashboard for tracking system resources. It displays CPU and memory activity through graphical charts and process lists. The tool features a customizable interface that supports predefined and custom visual theme files. It allows for the identification and termination of active system tasks and process groups using keyboard and mouse support.

Git-split-diffs is a command-line utility that renders version control changes as side-by-side, syntax-highlighted diffs directly within the terminal. It functions as a visualization engine that processes raw output from version control systems to improve the readability of code changes during terminal-based reviews. The tool distinguishes itself through a responsive layout engine that automatically toggles between dual-pane and unified views based on the available terminal width. It incorporates a regex-based tokenization system to apply language-specific syntax highlighting and supports use

python-qrcode is a library for generating QR codes from data and exporting them as images, vectors, or terminal text. It provides specialized encoders for producing portable network graphics, scalable vector graphics, and ASCII text representations. The project supports visual styling and custom branding, allowing for the modification of module shapes, the application of custom colors, and the embedding of logos. The capability surface includes image file export for digital assets and terminal-based visualization for displaying QR codes directly within a command line interface. It also manag

Notcurses is a terminal graphics engine and TUI library that renders high-fidelity images, video, and rich Unicode graphics directly in terminal emulators. At its core, it provides a layered framebuffer system that composes overlapping planes with independent depth and opacity, enabling complex visual scenes. The library also includes a terminal input processor for capturing and decoding keyboard and mouse events, a data visualization toolkit for histograms and line plots, a multimedia terminal player for images and video, and a TUI widget framework with reusable interface components. The lib

gui.cs is a .NET terminal user interface toolkit and framework used to build interactive, cross-platform text-based applications. It provides a structured system for composing terminal views using a view hierarchy and a dedicated layout engine. The library distinguishes itself through a component-based widget system and a constraint-based layout engine that allows interfaces to remain responsive across different terminal window dimensions. It employs a virtual-screen buffer to minimize flickering during redraws and uses state-driven theme configurations to maintain persistent visual styles.