Full metal panic & Full metal panic!
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Those 2 categories are for the same anime parody:
1) https://www.fakku.net/manga.php?select=Full+Metal+Panic&Submit=Select
&
2) https://www.fakku.net/manga.php?select=Full+Metal+Panic%21&Submit=Select
There is only one difference between those 2 category title, it's the "!" at the end of the second one.
Plus, one of the manga in category "Full metal panic!" (link 2) named "Random ni Saku Nobe no Hana ni" is in fact a Full metal alchimist parody.
1) https://www.fakku.net/manga.php?select=Full+Metal+Panic&Submit=Select
&
2) https://www.fakku.net/manga.php?select=Full+Metal+Panic%21&Submit=Select
There is only one difference between those 2 category title, it's the "!" at the end of the second one.
Plus, one of the manga in category "Full metal panic!" (link 2) named "Random ni Saku Nobe no Hana ni" is in fact a Full metal alchimist parody.