A list of non-alcoholic beers I can recommend:
Berg Cyriakus (<0.5%), nicely hopped. Only available regionally.
Wunderbräu Alkoholfrei Bio (0.4%), fruity, hoppy, reminds me a lot of Tilman Das Helle.
Tannenzäpfle Alkoholfrei (<0.5%), if you like the alcoholic version, this one tastes pretty much the same, perhaps slightly maltier and has less bitter aftertaste.
Gösser Natur Radler Alkoholfrei (0.0%), doesn’t taste like beer at all, just like the alcoholic version. Good and not too sweet drink for hot days nevertheless.