Follow these rules, or bad things will happen!
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Don't mix ROMs for different platforms - use generic BASIC with generic KERNAL, Ultimate64 BASIC with Ultimate64 KERNAL, etc.
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Don't mix these ROMs with any other ROMs; exceptions:
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kernal_hybrid*.rom, which is meant to be used (and has to be used) with the original BASIC ROM; however, these hybrid ROMs cannot be distributed due to legal/copyright reasons; see here for instruction how to create them
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chargen_*.rom - these ones are fully interchangeable
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Don't mix ROMs from different builds/versions (again, CHARGEN is an exception).
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The generic ROM set should be compatible with any C64-compatible machine; platform-specific ROMs might not work on other platforms.
Have fun!
PXL font was created by Retrofan, we got a permission to include it with Open ROMs under GNU Lesser General Public License 3.0, see here.