Altcoins, despite their recent market declines, have qualities that made them popular at some point. Here are some of the altcoins that have seen big drops recently and their characteristics:

Stacks (STX): This altcoin has fallen significantly since its high in March. Stacks is known for trying to bring smart contracts and decentralized applications to Bitcoin1.

SingularityNET (AGIX): Has seen a strong decline and is known for its goal of decentralizing artificial intelligence, allowing anyone to create, share and monetize AI services on the blockchain1.

Mina (MINA): Known as the world's lightest blockchain, Mina has a fixed size of around 22kb, which allows users to quickly and easily verify the chain1.

Render Token (RNDR): After losing parabolic support, RNDR, which is a distributed rendering network token, also suffered a sharp drop1.

Dash (DASH): One of the oldest altcoins, known for its fast and private transactions, lost upward support and also saw its value fall1.

These altcoins have in common the fact that they have innovated in their proposals, whether in scalability, decentralization of services or privacy. However, like any asset, they are subject to market fluctuations and other factors that can affect their value. It is always important to remember that the cryptocurrency market is highly volatile and investments should be made with caution.