The best alternatives to Lupus Online are Werewolf, Tradecraft, and BoardGameGeek. If these 3 options don't work for you, we've listed a few more alternatives below.
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One minute you're a Villager, defending your theoretical home with every fiber of your being. The next, you're a Werewolf, framing your friends and accusing them of wanting to destroy your village, when really it's you who's been infiltrating it all along. Each game becomes an epic phenomenon, designed to test your personal judgement and moral character.
BoardGameGeek (BGG) is an online forum for board gaming hobbyists and a game database that holds reviews, images and videos for over 101,000 different tabletop games, including European-style board games, wargames, and card games. There is also an annual Spring BGG.