I have made a new plugin for checking bounces. It supports the standard bounces methods (including jumpbugs), as well as rocket launcher setups. It also lets you check ground that is sloped, where it will then display bounces along the line where you aimed when you checked or you can select a wall that you can hug so you don't have to worry about landing on the line.
You can open the menu by typing /bcheck or /bounce in the chat. Then you can press 1 to select new ground or press 2 to select the floor you want to start on, a ceiling, or a wall. The menu will try to display the most simple bounces tailored around the rocket launcher you are using, but you can at any time expand the displayed list for uncrouched bounces, crouched bounces, and jumpbugs.
The source code and the compiled plugin can be downloaded from
GitHub (requires SM 1.10+).
To make live bounce checking enabled by default open cfg/sourcemod/abounce.cfg (auto-generated on first use) and set sm_abounce_live to 1.
Here is a preview video: