How to "draw" source code comment using text diagram?

Question

I found following diagram from http://webkit.org/coding/major-objects.html.

Is there a tool can draw graphics using characters like this?

 +---------+
 | Chrome  |
 +----+----+
      |
  +---+---+     +----------+
  | Page  +---->| Settings |
  +---+---+     +----------+
      |
      +-------------------------- ... other Frame objects
      |
  +---+---+   +-------------+                 +-------------------+
  | Frame +---+ FrameLoader +                 | JSDOMWindowShell  |
  +---+---+   +-------------+                 +---------+---------+
     / \                                                |
    /   \      /\  Re-used after navigation   /\        |
.../....|...............................................|..........
  /     |      \/  Replaced after navigation  \/        |
 /      |                                               |
/<------|<-- Ptrs to Frame are null after navigation[1] |
|       |                                               |
| +-----+-----+         +-------------+                 |
| | DOMWindow |<--impl--+ JSDOMWindow |<------window----+
| +-----+-----+         +-------------+
|       |
|       |<-- Can be null for Documents created by XMLHttpRequest
|       |
| +-----+-----+         +-------------+
+-+ Document  |<--impl--+ JSDocument  |
  +-----+-----+         +-------------+
        |
        |<-- Can be null for DocumentType objects
        |
    +---+---+           +--------+
    | Node  |<---impl---| JSNode |
    +-------+           +--------+

Thanks.

Answer 1

I believe it was this site, FossilDraw.

Hope this helps, Best regards, Tom.