Developper - I want to develop some plugins

I want to develop plugins for True Launch Bar, it is possible??

It most certainly is! Here's a link to the True Launch Bar Plugin Development Kit.

Thanks you.

Just another question. Do you have something for Delphi?

I asked about Delphi before. The answer, basically: do it yourself.
True Launch Bar is written in C++. See these past threads:
1 2 3

Good luck. Let us know how you do.
/Mark