It is not at all clear what you are trying to do.
If you are (literally) wanting to "gut" your classes and provide people with skeletons, then:
I am not aware of an existing Eclipse plugin or other tool to do it. (And asking us to find / recommend software is off-topic.)
It is probably a bad idea anyway. Certainly, this is not what people normally mean by "sharing your code".
There are better alternatives:
Give people the compiled code (don't obfuscate it!) and they can discover the API's using an IDE. Depending on the compilation flags, you may lose the names of method parameters. Make sure you compile with maximal "debug" information.
Generate and provide javadocs. This will provide people the same information as your "stripped" source code.
On the other hand, if you real goal is to provide an API that other people can implement, the correct way to do it is to define the API using interfaces rather than classes. And Eclipse does support that. There are standard Eclipse refactors that will extract a Java interface
from the source code of an existing Java class
.