Takamin Pchat is an online drawing site like FlockDraw or Pixiv chat. The main advantages are that you don't need to make an account to draw, it has a bigger canvas (2000x1500 pixels), and it doesn't have a time limit.
I made a room in there for OYP:
Click on the left button labeled "チャットを開始" to use the Java version. The other button is for the new flash client, which is still in beta. These two are incompatible with each other.
Some guides for the Java client:
Updated by Kakak2008