protobuf-dt is Google’s Eclipse-based editor for protocol buffers. It provides all the features you’d expect from an Eclipse editor (syntax highlighting, outline view, content assist, etc.) plus some protocol buffer-specific features, such as "Open Declaration" (hyperlinking) support, including imported .proto files, configurable integration with protoc, and automatic removal of trailing whitespace.
Sigasi is an intelligent Eclipse- based development environment (IDE) for the VHDL language. It contains an ultra-fast VHDL parser and compiler that runs transparently in the background. At any given moment as you make modifications, the tool fully understands the design in terms of VHDL concepts. It allows you to write code faster by providing intelligent code completion, instant error reporting, intelligent navigation, mouse-over descriptions, a hierarchy browser, version control, issue and time tracking, and project and code templates.