LLDB, the LLVM debugger and LLVM's equivalent to GDB, has been growing in use and functionality. LLDB is now just not used by OS X developers but is gaining more Linux support (most recently, Linux 64-bit Core File Support). LLDB has also piqued the interest of Intel and gaming companies like Valve Software and RAD Game Tools.
The latest feature improvement for LLDB is with its "platform" command for interfacing with remote systems. This improved platform support now can query OS / kernel information, push and pull fixes, run shell commands, and various other tasks. Right now the support is implemented for at least OSX/Darwin and Linux systems. Still forthcoming is to be able to run the LLVM test suite capability and a new platform logging category.
More details on the LLDB improvement can be found via this commit to be part of LLVM 3.4.