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Roundcube alternatives & similar sites

Roundcube - Free and Open Source Webmail Software — 18 websites ranked by shared content topics, category and on-page relevance.

Each result shows its full tech stack, contacts and AI-policy — not just a name · Browse all sites in Email →

Domain	Match	Title	Country/Lang	Category	AI files	Contact	AI-protection
phpmyadmin.net ↗	112 match 190 shared linkers · same topic	phpMyAdmin	en	databases	robotsllmsaihumans	emailphone	none
owncloud.org ↗	16 match 9 shared linkers · same topic	ownCloud - share files and folders, easy and secure	Germany~ en	cloud-computing WordPress	robotsllmsaihumans	emailphone	none
redmine.org ↗	16 match 10 shared linkers · same topic	Overview - Redmine	en	software-and-applications	robotsllmsaihumans	emailphone	none
mariadb.org ↗	16 match 9 shared linkers · same topic	MariaDB Foundation - MariaDB.org	en	databases WordPress	robotsllmsaihumans	emailphone	none
mysql.com ↗	15 match 16 shared linkers · same topic	MySQL	en	databases	robotsllmsaihumans	emailphone	none
ccc.de ↗	15 match 8 shared linkers · same topic	CCC \| Startseite	Germany de	technology-and-computing	robotsllmsaihumans	emailphone	none
git-scm.com ↗	14 match 12 shared linkers · same topic	Git	en	software-and-applications	robotsllmsaihumans	emailphone	none
php.net ↗	14 match 22 shared linkers · same topic	PHP	en	programming-languages	robotsllmsaihumans	emailphone	none
debian.org ↗	14 match 16 shared linkers · same topic	Debian -- The Universal Operating System	en	operating-systems	robotsllmsaihumans	emailphone	none
nextcloud.com ↗	14 match 19 shared linkers · same topic	Nextcloud - Open source content collaboration platform	en	cloud-computing WordPress	robotsllmsaihumans	emailphone	none
nginx.org ↗	14 match 10 shared linkers · same topic	nginx		web-development	robotsllmsaihumans	emailphone	none
python.org ↗	13 match 9 shared linkers · same topic	Welcome to Python.org	en	programming-languages	robotsllmsaihumans	emailphone	none
sourceforge.net ↗	13 match 9 shared linkers · same topic	Compare B2B Software, Download, & Develop Open Source & Business Software - SourceForge	United States~ en	software-and-applications	robots llmsaihumans	emailphone	none
parallels.com ↗	13 match 11 shared linkers · same topic	Parallels \| Run Windows on Mac, VDI, and Enterprise Virtualization Solutions	en	software-and-applications TYPO3	robotsllmsaihumans	emailphone	none
gitlab.com ↗	13 match 9 shared linkers · same topic	Finally, AI for the entire software lifecycle.	en	artificial-intelligence	robotsllmsaihumans	emailphone	none
github.io ↗	12 match 8 shared linkers · same topic	GitHub Pages \| Websites for you and your projects, hosted directly from your GitHub repository. Just edit, push, and your changes are live.	en	web-development	robotsllmsaihumans	emailphone	none
freemusicarchive.org ↗	6 match 9 shared linkers	Royalty free music and 'free to download' music - Free Music Archive	en	music	robotsllmsaihumans	emailphone	partial · 11
home-assistant.io ↗	4 match 9 shared linkers	Home Assistant	en	smart-home	robotsllmsaihumans	emailphone	none

How the match score works

Each match is a 0–100 similarity score — the higher it is, the more two sites resemble one another. It’s computed automatically from our own crawl data (never from what a site says about itself) by combining several independent signals, so a high score means several of them point the same way:

shared topics how many of the same fine‑grained content topics (IAB sub‑categories) both sites cover — the main signal.
same category whether they sit in the same business / industry category.
content & title how closely their titles and page descriptions line up in wording and meaning.

No single signal decides the result — they’re blended together. Treat the score as a way to rank candidates rather than an absolute percentage; the chips on each result show which signals contributed.