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| JPG Compression | |
| https://github.com/google/guetzli/ |
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| Freie Bilder: | |
| https://unsplash.com/ | |
| Shields: | |
| http://shields.io/ | |
| Freie Bücher: | |
| https://de.wikibooks.org/wiki/Hauptseite | |
| https://hpbn.co/ | |
| https://www.dpunkt.de/openbooks.php | |
| http://www.oreilly.com/openbook/ | |
| https://www.rheinwerk-verlag.de/openbook/?GPP=oplinux5 | |
| http://book.mixu.net/ | |
| https://www.gitbook.com/explore |
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