Tera is a decentralized application platform. This is akin to an operating system. Tera consists of a repository of programs and data storage integrated into the Internet. The mechanism for publishing programs and data on this platform is free from censorship. The circulatory system is the blockchain.
Kava is a DeFi platform that offers collaterized loans and stablecoins built with the Cosmos SDK. It aims to be cross-chain enabled bringing stablecoins to major crypto ecosystems such as BTC, BNB, ATOM and more. KAVA token will act as a governance and staking token to secure the network and vote on key upgrades. USDX token will be issued as a stablecoin backed by crypto asset collateral. Some calls it the MakerDAO on Cosmos. While USDX will be have similar to DAI, the USD stablecoin on Ethereum.