Image viewer without antialiasing

Geeqie is lightweight and will do the job.

To install sudo apt-get install geeqie

In order to disable anti-aliasing go to Edit > Preferences > Preferences > Image and change zoom quality to nearest and disable two pass rendering.

In order to show pixel coordinates and RGB value go to View and check Pixel Info

The default Linux Image Viewer (as of now at least) supports the no anti-aliasing option: go to Image Viewer > Preferences > Image Viewer and turn off Smooth images when zoomed out/in. The infinite zoom-in is still missing.