# Testnets

- [Althea](/testnets/althea.md): Althea is an application platform layer that connects all public blockchains in the Cosmos ecosystem
- [Installation](/testnets/althea/installation.md)
- [Useful Commands](/testnets/althea/useful-commands.md)
- [Hypersign](/testnets/hypersign.md): Hypersign is a decentralized identity layer for the internet, giving users control of their personal data and identity whilst digital enabling trust for businesses
- [Installation](/testnets/hypersign/installation.md)
- [Useful Commands](/testnets/hypersign/useful-commands.md)