You need to specify further. What do you mean by a low market cap altcoin? Do you mean alts which are having $1 billion? Or those having market cap of less than $100 million? I would consider an altcoin as a low market cap coin, only of the market cap is less than $1 million. There are a few promising ones in this category (provided that the development continues without any issues), such as Veil, DeepOnion and eBitcoin.
in my standard understanding, low market capitalization is less than $ 10 million. A coin with such a capitalization has very good chances to bring very high profit to their investors
i must admit that among my fav projects i also have 4 that i prefer the most, cartesi is one of them.
These 4
Cartesi
Utrust
Noia
Lusko
At Lusko and utrust from development interest and experience with the dev exchange