Infra Recorder is a very good software that I use to burn CDs and DVDs on my Windows machine. I’ve used it to burn data CD/DVDs, and work with iso files. Which means, bye bye proprietary Nero. According to the site, its full features are:

• Create custom data, audio and mixed-mode projects and record them to physical discs as well as disc images.
• Supports recording to dual-layer DVDs.
  
• Blank (erase) rewritable discs using four different methods.
• Record disc images (ISO and BIN/CUE).
  
• Create disc copies, on the fly and using a temporary disc image.
• Import session data from multi-session discs and add more sessions to them.
• Save audio and data tracks to files (.wav, .wma, .ogg, .mp3 and .iso).

This program is a Windows only. Sorry, I usually try to find cross-platform programs but I wasn’t able find one for this category.