Folder SimpBurn is a compact and portable tool which can burn folders to disc, and create ISO images.
The program has all its options on a single dialog, and this makes it very straightforward to use. At a minimum all you need to do is choose your optical drive, select a folder which you'd like to burn, click Burn Option > Start Burn, and then watch as your disc is created (CDs, DVDs and Blu-rays are supported, as single and multisession discs).
If you need more control, then it's also possible to set the maximum burning speed and the disc name, as well as choosing the file system (your options are ISO9660, Joliet, UDF, or Joliet/ UDF).
There's some ISO support, too. Click "Burn Option" and you'll find tools to save your selected folder as an ISO file, or burn an existing ISO file to disc.
And other small touches include some disc erase tools, and an "Info" box which displays your disc burner's capabilities.