GPL Tools
Browse GPL licensed tools. Apply filters to refine results.
Showing 134 tools
Netdata Logs
Real-time monitoring and troubleshooting with integrated log viewer
Mastodon
Decentralized social profiles that provide high crawlable search signals
Metabase
Open-source BI tool that makes SEO data exploration easy for teams
Directus SEO
Open-data platform that turns any SQL database into a headless CMS with SEO meta management
AdGuard Home
Network-wide software for blocking ads and tracking and managing DNS traffic
SingleFile
Chrome extension that saves an entire page into a single HTML file for archiving
SearXNG
Privacy-respecting metasearch engine and alternative to Google
LanguageTool API
Open-source proofreading service for more than 30 languages with an accessible developer API
Http-Toolkit
Open-source tool for intercepting, debugging, and rewriting HTTP traffic for routing validation
Grafana Mimir
Horizontally scalable long-term storage for Prometheus metrics and logs
DefiLlama
Leading DeFi aggregator for tracking search volume by TVL and protocol
Newspack SEO
Specialized SEO toolset for small and medium-sized news publishers on WordPress
SEOPress
Lightweight and fast SEO plugin for WordPress with white-label features and no footprint
Grafana
Observability and BI platform used for real-time SEO monitoring dashboards
Bitwarden (Self-Hosted)
Open-source password management solution that can be hosted on your own infrastructure
Yoast SEO (Free)
The most popular WordPress SEO plugin for on-page optimization and sitemaps
Glances
An Eye on your system. A curses based monitoring tool for Linux/Windows/macOS
Matomo Analytics
Leading open-source web analytics platform that gives you full control over your SEO data
Matomo Heatmaps
Privacy-focused heatmap plugin for the leading open-source analytics platform
Matomo
Privacy-focused open-source web analytics platform that provides 100% data ownership
HAProxy
High-performance load balancer and routing software for complex domain architectures
Gensim
Topic modeling for SEO to discover semantic relationships between keyword clusters
Lynis
Security auditing tool for Linux, macOS, and UNIX-based systems
LanguageTool
Open-source grammar, style, and spell checker for high-quality SEO content
Wappalyzer
Identify web technologies on websites including CMS frameworks and payment processors
Wappalyzer CLI
Automated technology stack detection for lists of websites via command line
Cockpit
Web-based graphical interface for Linux servers to monitor and manage system services
OpenCart
Free open-source eCommerce platform with a massive marketplace for SEO extensions
HSTS-Checker
Python tool to check for HTTP Strict Transport Security implementation across site lists
Gutenberg-SEO-Parser
Parse WordPress Gutenberg blocks to analyze content structure and keyword density
WooCommerce
The most popular open-source eCommerce plugin for WordPress with extensive SEO extension ecosystem
Email-Harvester-SEO
Scrapes contact information from websites for link building outreach campaigns
OpenProject
Open-source project management for secure SEO infrastructure
Graylog
Centralized log management platform for deep dive into server-side SEO issues
ExifTool
Powerful command-line application for reading writing and editing document metadata including PDF and images
Vips
Extremely fast, low-memory image processing library with bindings for many languages
Nikto
Open source web server scanner which performs comprehensive tests against items
Countly
Product analytics for mobile and web that can be self-hosted for complete data control
Pa11y
Command-line interface to run accessibility audits and monitor SEO performance
WooCommerce SEO
Open-source SEO extension for WordPress e-commerce stores
WhatWeb
Next-generation web scanner that identifies CMS platforms, plugins, and server headers
Open-Web-Analytics
Open source web analytics that provides similar features to Google Analytics
Syslog-ng
Flexible and highly scalable system logging application for multi-platform
MTR
Combined ping and traceroute tool for diagnosing network latency and packet loss
Rsyslog
The rocket-fast system for log processing with high performance features
Trafilatura
Python package and command-line tool to gather text and metadata on the web
Open-Source-GEO
Library for managing geographic coordinates and local business schema for SEO
EditThisCookie
Manage cookies for SEO testing including location spoofing and session management.
Pushshift.io
Large-scale Reddit data API used by researchers for massive historical data analysis and SEO patterns
Tab Manager Plus
Efficiently manage hundreds of tabs with search filter and deduplication features
AWStats
Advanced Web Statistics tool for generating graphical reports from server logs
GrandNode
Open-source cross-platform eCommerce solution based on .NET Core and MongoDB for SEO speed
Yoast Real-time Content Analysis
SDK for developers to integrate Yoast-style SEO analysis into custom publishing platforms
SeoPanel
Open source SEO control panel for managing multiple sites and tracking keyword rankings in one place
DNSViz
A tool for visualizing DNSSEC response chains and troubleshooting DNS propagation issues
Koko Analytics
Privacy-friendly analytics plugin for WordPress that does not use cookies or external services
Link Gopher
Browser extension to extract all links from a webpage and sort them for outreach lists
Scraper (Chrome)
Simple data mining extension that facilitates harvesting link opportunities from SERPs
Autoptimize
Optimization plugin that aggregates and minifies scripts and styles for faster loading
Bash Toolkit (grep/awk)
Essential command-line tools for manual log parsing and SEO filtering
Bing URL Submission Plugin
WordPress plugin for automatic URL indexing to Bing and IndexNow
Drupal Simple XML Sitemap
The standard module for Drupal to generate multilingual and custom entity sitemaps automatically
Easy Table of Contents
Automatically creates SEO-friendly table of contents for long-form content
GeneratePress
SEO-optimized, lightweight WordPress theme built for maximum performance
Gnu-Wget
Command-line utility for retrieving files using HTTP/HTTPS frequently used for site mirroring
HREFLANG Tags Lite
Simple management of hreflang tags for international SEO on WordPress sites
HeidiSQL
Lightweight, open-source SQL client for Windows to manage databases and servers
ImageOptim
Desktop application that optimizes images to reduce load times and improve LCP and overall speed
Journald
Systemd logging service for modern Linux distributions with binary logs
NVDA Screen Reader
Free and open-source screen reader for Windows enabling blind people to use computers
Nmap
Industry standard tool for network exploration and security auditing
Redirection (WordPress)
Popular WordPress plugin to manage 301 redirects and track 404 errors without HTACCESS knowledge
Scribus
Open-source desktop publishing software capable of creating highly structured and SEO-ready PDFs
Simple 301 Redirects
Lightweight solution for managing WooCommerce URL changes during site migrations or deletions
SmokePing
Latentcy logging and graphing system for monitoring network connections
The SEO Framework
The only feature-complete SEO plugin that follows white-hat guidelines strictly
W3 Total Cache
Advanced performance plugin for WordPress with comprehensive caching features
WP Site Icon Customizer
WordPress-specific enhancer for the built-in Site Icon feature allowing for better cropping and previews
WP Sitemap Page
WordPress plugin that generates a beautiful, customizable HTML sitemap page for site visitors
WP-Optimize
All-in-one database cleaner and image compressor to maintain a lean SEO-friendly backend
WPBakery SEO
Add-on to ensure SEO analysis tools can read content inside WPBakery builder
Webalizer
Fast free web server log file analysis program producing HTML reports
WooCommerce Google Analytics
Connects WooCommerce stores to GA4 to track SEO conversions and product performance data
XML Sitemap Generator
Standalone WordPress plugin that creates highly customizable sitemaps for deep WooCommerce stores
Yoast SEO
The most popular SEO plugin for WordPress providing real-time content strategy and optimization
Yunohost
Debian-based OS for self-hosting web services with ease and automation
Zabbix Performance
Enterprise monitoring solution that can be configured to track website performance metrics
Postiz
Open-source social media and SEO content scheduling platform with AI insights
Quickwit
Sub-second search engine on cloud storage for log management and SEO
Linkwarden
Self-hosted collaborative bookmark manager with routing preservation and archiving
Dub.co
Open-source link management infrastructure for modern marketing teams
LinkStack
Self-hosted link-in-bio platform for managing backlink landing pages and professional profiles
SEO Audits Toolkit
All-in-one open-source collection for website health and security
Keyword-Clustering-Tool
Python script that clusters keywords based on SERP similarity to group intent
Open-SEO-Writer
AI-powered content generator optimized for specific keyword density and intent
Swetrix
Fully open-source and privacy-focused analytics with deep focus on performance and SEO tracking
SERP-Volatility-Tracker
Monitors daily fluctuations in search results to detect Google algorithm updates
SEOlizer
Open-source tool for real-time log analysis and technical SEO monitoring
Search-One Local SEO Tool
Open-source repository for scraping local search results and identifying competitors
Searchviermu
Python-based automation scripts for bulk SERP analysis and keyword intent
Free-GPB-Auditor
Open-source script for auditing Google Business Profiles for local ranking factors
SEOPivot
Emerging open-source desktop dashboard for monitoring site health and schema
Search engine keywords
CLI tool for fetching keyword suggestions from various search engine autocomplete APIs
LLM-Benchmark-Crawler
Scripts to automate querying multiple LLMs and tracking brand citation frequency
Slim SEO
Automated and lightweight SEO plugin with zero configuration required for beginners
Scry
Open-source oracle search explorer for tracking price feed SEO accuracy
GN Publisher
WordPress plugin that optimizes RSS feeds for Google News and Publisher Center
SocioBoard
Open-source social media management with white-label capabilities for marketing agencies
MassDNS
High-performance DNS stub resolver for bulk lookups and reconnaissance
Wapiti
Open-source web security auditor that identifies SEO-impacting vulnerabilities
Knockpy
Python tool designed to enumerate subdomains on a target domain through a wordlist
Polyglot
Multilingual NLP library for keyword extraction and entity recognition in diverse languages
Subreddit Analysis
A Python-based tool for scraping and analyzing subreddit data for SEO and linguistic patterns
Domain MOD
Open-source application to manage your domains and registrars
Glogg
Multi-platform GUI to explore and search through long or complex log files
Web Archives
Browser extension to view archived and cached versions of web pages
PySEO Tools
Open-source Python scripts for automating repetitive SEO tasks and audits
Page Ruler Redux
Measure page elements in pixels for layout and UX optimization
Site-Inspector
Open-source tool to find broken links and common technical SEO errors
User-Agent Switcher
Switch between different user-agents to test mobile and bot crawling
Readability-LXP
Library for measuring text readability scores (Flesch-Kincaid) for content optimization
Tanaguru
Open-source automated accessibility assessment tool focused on high-volume website testing
Analog
Extremely fast log file analyzer that provides basic traffic and bot statistics
BacklinkChecker
Open-source Python utility for monitoring backlink status and detecting removed links
Keywords Every Day
Open source alternative for keyword and competitor lookup
Word Counter Plus
Simple tool to count words and characters in selected text on any web page
NoFollow Simple
Highlights all nofollow and sponsored links on a page to visualize internal link equity
Quick SEO
A lightweight toolbar for quick access to domain and page SEO metrics
Sitemap Mergetool
Simple command line utility to merge multiple XML sitemaps into a single index file automatically
SeoToaster
Open-source CMS and e-commerce platform with built-in scheduled SEO crawling
Sitemap Downloader
Automatically finds and downloads XML sitemaps for the current domain
WP Local SEO
WordPress plugin for local business schema and map integration
Sitemap XML Editor
Open source desktop editor for Windows to manage and edit extremely large XML sitemaps offline
StoreToolkit for WooCommerce
Maintenance and SEO optimization tools for clearing data and fixing site structures