Steemyy is available in English and Korean. This website was developed by @justyy
The main page has menu on the very top, some statistics from the last 24 hours, links which allows you to support the author or vote for the witnesses.
There are also few links at the bottom which are basically some crypto market sites where exchanges of crypto currency can be made.

Blockchain overview

The first thing you see when login to steemyy is blockchain overview. This page contains information about the key properties or overview of the Steem Blockchain which is based on steem-Js(v0.7.7). Chain properties under the blockchain overview has two main features. The key and the value. For example you can find the witnesses and it related value.
This can be seen in the image below.

Block explorer

Block explorer tool is created mostly for the witnesses. It allows you to check all the data and transactions about blocks. For instance the time someone created his block, the value and what transactions has been made with it.

Tools

One of the most important part of the website is the tool which allows us to search the information on the platform.

These list can be viewed searched on the tool. Things that has to do with the accounts, ordered by account worth in USD, Steem Power, Effective Steem Power, STEEM, SBD, reputation and others in "Steel Accounts Ranking".

Checking data of any user in "Steel account information can be donej". You just have to type the users name in the searcher to see how much SP they have.
The worth of their vote, when they created the account. The last transactions they've made and other things.

Reseting of your password in "Steel Account Keys and Password generator"
You can use "Steel SP delegation tool" to delegate part of your steem power to your favourite community or another user to support their growth.

Money can be sent to multiple accounts, using Steem Wallet Tool. Send SBD or STEEM to Multiple Accounts. You need to type your username, password, add the amount and the list of users you want to transfer money to.

You can also set multiple transfer which will send the money within few minutes. You decide the time margin you wish to transfer.

Steem Account Transfer Viewer helps you to check the history of transfers of every user. You can select from the list you want to see. Only incoming or outgoing transfers, SBD or STEEM, encrypted, non-encrypted, with or without memo.

In "Steem auto claim Scot tokens" and "steem autoclaim rewards" you automatically get the rewards without the need to click "redeem your reward" each time you get some SP or SBD for your post. All that you need is your profile name and keys.
"Steem conversation viewer" allows for quick search of the conversation between two users. You just have to type two profile names and check all the history of conversation between them in the form of upvotes and flags.

There are links to check all these things.
There are many more important information in there. List of current people who powered down and their SP and many more can be tracked. All these informations and other ones are very useful for our daily activities us steemanians.