Geany-setters-getters-generator-plugin is a project mainly written in C, it's free.
Plugin for Geany IDE to generate setters and getters methods in OO-languages
This is a Clang-driven Geany C++ class setters/getters generator.
You'll need Clang and llvm 2.8+ to build this plugin. (not sure, tested with 3.0-trunk only)