CKB Block Exporer

https://github.com/nervosnetwork/ckb-explorer-frontend

Pros

• Built with React (and Ruby on Rails)
   
• Looks beautiful!

Cons

• Ruby on Rails might be annoying to deal with

TON Explorer

https://github.com/broxus/ton-explorer-frontend

Pros

• Has a (randomly generated) user icon, which is a good touch
• Minimalistic UI which I like

Cons

• Uses angular I think

Enecuum Explorer

https://github.com/Enecuum/explorer

Pros

• Has more functionality (map?)

Cons

• Doesn't look as nice as the previous
• Not written in React (I think)