I had first heard of the browser based wallet Telescope 18 months ago.

I've been working on Op-Wallet off and on for the past year for some of my own projects because I want to write web applications.

Read.cash needs wallets for its readers, so there's another one.

Plus, I just read about slightly more than two implementations (or planned implementations) today.

https://mint.bitcoin.com/, which is based on (or an implementation of) https://pitico.cash/

https://nito.cash/

So, it looks like there's a common need for websites to want their own in-site/on-premise/non-custodial crypto-functionality. And I can't think of a better-suited coin than Bitcoin Cash to handle it with its low fees!

As far as I can tell, all of these wallets are intended to act as Simplified Payment Verification (SPV) wallets. Assuming growth continues and more developers move up the app stack, this SPV infrastructure will become more critical. Hopefully an ecosystem of diverse providers will arise as well.

Right now, many wallets use https://rest.bitcoin.com to handle their network needs, but I can imagine as quality-of-service becomes more critical, different models of provision (either as infrastructure hosting or service provider) may arise. As the pieces of the ecosystem become more mature, this will be an exciting development to watch.