SimpleSwap is an instant crypto swap service, running since 2018, that routes across 20+ centralized and decentralized providers. It lists 2,800+ cryptocurrencies on 100+ networks, with fixed and floating rates, no account for most swaps, and iOS/Android apps.
Swapuz is an instant crypto swap service, founded in 2019, that lists 760+ cryptocurrencies with fixed or floating rates and routes trades across centralized and decentralized exchanges. It includes many XMR pairs, WalletConnect deposits and an Android app.
ChangeHero is an instant crypto swap service, founded in 2017, for 250+ coins with no account needed. It offers a floating "Best Rate" and a fixed rate, and fiat buy/sell through partners.