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Open source video conferencing platform for browser-based meetings and self-hosted calls.

Self-hosted app for saving bookmarks, notes, and web resources in a personal knowledge library.

Self-hosted bookmark manager for tagging, searching, and organizing saved links.

Linkwarden

linkwarden.app

Self-hosted bookmark manager for saving links, archiving pages, and organizing web resources.

Minimal self-hosted RSS reader focused on fast, clean feed reading and simple management.

Open-source storage, sharing, and sync with end-to-end encryption, protected metadata, hosted accounts, and self-hosting support.

Open-source web analytics with an EU-hosted service, self-hosting option, and aggregated measurements without cookies or persistent identifiers.

Dead Link Checker checks website availability, outages, broken links, or service status from the web.

Online Broken Link Checker checks website availability, outages, broken links, or service status from the web.

Cybernews checker for seeing whether an email or phone appears in known data leaks.

IP intelligence tool for checking scan traffic, noisy hosts, and suspicious internet activity.

Shodan InternetDB lookup for checking open ports, vulnerabilities, tags, and host data by IP.

OSINT.sh IP lookup for checking geolocation, ASN, network, and hosting information.

Checker for seeing whether an email appears in the historical Ashley Madison breach dataset.

Audio Quality Check Guide points to a Reddit community or thread with discussion, updates, troubleshooting, or shared resources.

Broken Link Checker

webextension.org

Broken Link Checker is a browser extension or add-on that improves everyday web browsing workflows.

Broken Link Checker crawls websites to find broken links, redirects, and technical SEO issues.

Check for Cloudflare is a developer resource for coding, documentation, communities, security research, or software tools.

Check Mic is a system utility for Windows, hardware checks, cleanup, process control, or desktop customization.

Check My Links

chromewebstore.google.com

Browser extension for Check My Links, adding useful tools or workflow improvements inside the browser.

Checkbot SEO checker

checkbot.io

Checkbot SEO checker checks page speed, performance, technical issues, and web quality signals.

Checkbox Life is a miscellaneous web resource for discovery, directories, archives, web culture, or useful tools.

Checkbox Olympics is a miscellaneous web resource for discovery, directories, archives, web culture, or useful tools.

CheckFileType supports reverse engineering, malware analysis, file inspection, or security research workflows.