gSim is a free program (doesn't appear to be open source -- I can't find the source anyway) for processing 1D and 2D nmr spectra. I don't have much to say about it other than that it seems to provide all the things I require of an NMR processing program, including line fitting (deconvolution).
One neat extra is that gsim has a terminal-like window at the bottom similar to xwinnmr/topspin so that you can control the processing completely via the keyboard.
gSim can be downloaded from http://sourceforge.net/projects/gsim/
|installation via gdebi|
|can read bruker files|
|overview of processing options. I had to select bruker to correct the fid before doing ft|
|zooming is a bit awkward, but can be done using the mouse|
|I had some issue with deconvolution|
|awkwardly it uses ppm for the width too if the x axis is in ppm|
|you can always switch to hz though|
|gsim also reads the acqu/s files|
|It can output the spectrum to eps in case you're too lazy to work in gnuplot|