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Trisquel
Since long, Trisquel made DuckDuckGo as the default search engine. Its web browser is called Abrowser. Trisquel is the official operating systems in laptops offered by Respects Your Freedom. Visit www.trisquel.info to learn more.
PureOS
Purism company is currently the only company from Free Libre Open Source Software community who develops both their own hardware and software in a brand -- comparable to Apple from proprietary world --. Purism manufactures Librem secure phone and laptop products, has their own user's security focused OS called PureOS, its browser is called PureBrowser, and its default search engine is DuckDuckGo. Visit puri.sm and pureos.net to learn more.
openSUSE
The European green gecko operating system, openSUSE, made DuckDuckGo as its default search engine in its Firefox browser. Its own portal is located in search.opensuse.org that resulting to DuckDuckGo. Here's openSUSE 15.3 searching the key word 'opensuse' on the web.
Tails
Tor Browser
This is an application and not operating system. It is a modified version of Firefox Browser with the addition of The Onion Router Network, an encrypted peer to peer network in the internet. However, it is available for Android, GNU/Linux, iOS, MacOS and Windows. The point is Tor Browser uses DuckDuckGo search engine by default. If the user installs Tor Browser, they will get DuckDuckGo in these five OSes selection. Also, it is the built-in browser of Tails operating system mentioned above. Visit torproject.org to learn more.
Falkon
Formerly QupZilla, it is also an application not an OS, made DuckDuckGo as its search engine. Today, Falkon is part of The KDE Project hence it is one family with Qt, Plasma Desktop and Plasma Mobile. Visit falkon.org to learn more.
About DuckDuckGo
DuckDuckGo is a United States based search engine that promises user's privacy and no user tracking. It is praised as well as recommended by several parties, including PRISM Break, PrivacyToolsIO, while several parts of Free Libre Open Source Software community also choose it over another search engines with the examples mentioned above.