Eclipse CDT is a whole IDE; is rather complex, and one might even say convoluted; and is Java based. Seer is none of these things.
Of course - it's not like a GDB GUI is a novelty in itself, there are quite a few. But a GDB-GUI-only utility is a meaningful and important niche to consider.
Of course - it's not like a GDB GUI is a novelty in itself, there are quite a few. But a GDB-GUI-only utility is a meaningful and important niche to consider.