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I know about US International with dead keys that uses dead keys like ' ` ^ " before typing the letter with the diacritic.
Are there other QWERTY layouts with all French diacritic characters (à, â, é, è, ê, ê, ë, î, ï, ô, ù, û, ü, ç)?
UPDATE:
It seems that the question is too broad in its initial form that said "Latin diacritics" beside "French characters": some QWERTY keyboards that have Latin characters with diacritics lack part of the French characters. The US International with dead keys in Linux (US international in Windows) has all the French characters, but US International AltGr dead keys that I found in Linux has more Latin characters with diacritics while lacking essential French letters like é.
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Could this maybe help you? http://marin.jb.free.fr/qwerty-fr/
– BramMooij – 2016-05-12T09:36:53.473@BramMooij - you should post this as an answer. In Linux Mint KDE was installed successfully and can be found as a variant of the English US layout – None – 2016-05-12T09:56:07.593
Good to know, when previously answering, I didn't have time to properly check out the website. I posted an answer, please let me know whether I should expand it. – BramMooij – 2016-05-12T13:05:10.840
@BramMooij - considering expanding the answer: I have tried to edit it to add those lines on what keys do what. – None – 2016-05-12T14:40:25.400