I would recommend CodeBlocks.
Highlights:
- Open Source! GPLv3, no hidden costs.
- Cross-platform. Runs on Linux, Mac, Windows (uses wxWidgets).
- Written in C++. No interpreted languages or proprietary libs needed.
- Extensible through plugins
Compiler:
- Multiple compiler support:
- GCC (MingW / GNU GCC)
- MSVC++
- Digital Mars
- Borland C++ 5.5
- Open Watcom
- ...and more
