Hello !
Here is a small effort to get you the links of all the Div1, Div2, Div3, Educational and Global rounds. Along with the links, an option to get the unique contests is there. If selected, only those contests will be displayed, of which you have never attempted any question. Thus, one can give virtual contest of that round.
link : https://clashofcodes.herokuapp.com/
For all contests : https://clashofcodes.herokuapp.com/division
We also saved all the questions from The Ultimate Topic List to our database to filter out the questions of your need and mark them as solved if you want.
Apart from this, we have a contest page where in you can make a room where others can join that room with the appropriate ID. Only those questions will be there which are unattempted by any of the participants. This is somewhat similar to Codeforces mashup, but here the questions are filtered automatically.
You can also view you codeforces and codechef statistics and compare your performance with that of your friend
We posted a similar blog earlier https://mirror.codeforces.com/blog/entry/90207. Later we updated the UI and added a couple of more features.
Thanks JustAGeek for working along.
Feedbacks are highly appreciated. Thank you