Solidity Docs - Should really be your first stop in your Solidity journey, straight from the horses mouth with plenty of examples including a hello world smart contract. Lots of references to Ethereum but as mentioned earlier, anything that is applicable to ETH is applicable to Harmony. Source: about 3 years ago

Ontochain projects have not yet begun to use the sidechain, but they should be very soon. The oracle factory upgrade from the beta version, should also give much more usage to the iexec marketplace. You can find current usage at :https://iex.ec/ . Source: almost 2 years ago

Let us know what you think: https://iex.ec. Source: almost 2 years ago

iExec (RLC) claims to have developed the first decentralized marketplace for cloud computing resources. Blockchain technology is used to organize a market network where users can monetize their computing power, applications, and datasets. By providing on-demand access to cloud computing resources, iExec is reportedly able to support compute-intensive applications in fields such as AI, big data, healthcare,... Source: almost 2 years ago

There are also lots of compute networks, that compete with cloud offerings of AWS, and google cloud and microsoft. Like Golem, pp.io, iex.ec, etc. Source: over 2 years ago

It's the explorer listed on iexec's website https://iex.ec/. Kinda alarming if a person wanted to setup an account with them to have a worker earn RLC. Looks like they wouldn't even be able to and it's been down for hours. Source: almost 3 years ago