If Architect and Oracle are old programs which created the matrix. Does it say anywhere who built them?
The Matrix Wiki explains that:
The Architect was constructed by other machines in a human image to understand the nature of humans
who in turn created The Matrix.
Following the failure of the first Matrix, to understand humans, The Architect:
turned to a more human intuitive program designed to understand human nature and psychology to augment the framework of the next Matrix.
This program was The Oracle
It is not made clear whether The Architect created The Oracle or not. On the one hand, it is possible that The Architect did create The Oracle to further his understanding of human nature and psychology. On the other hand, like The Architect, other machines may have created The Oracle, as the Architect lacked sufficient understanding of human nature to imbue The Oracle with her intricate knowledge of humankind. This second view is supported by the fact that The Oracle is considered 'the mother' (note, not the 'daughter') of the Matrix, whilst The Architect is considered to be 'the father'.