Gita doesn't say that God created the caste system. The four "varnas" are loosely translated as "castes" but that is not quite so. A varna is defined by an individual's occupation. Those who teach are brahmanas, those engaged in ruling the kingdom and protecting people are kshatriyas, those involved in business are vaishyas and those performing jobs like construction, farming etc. are shudras.
It is unfortunate that many consider a "varna" to be the same as "caste". The latter is a degeneration found aplenty in the Indian society whereas the former is simply a way of classifying people based on their occupation.
There is no parallel to the teachings of Gita. In 18 chapters, it covers all aspects of God, universe and individual and also the means of attaining liberation.
Yes, Ashtavakra Gita is a vedantic text that focuses on describing the absolute truth.
Bhagavad Gita is more versatile since it covers the many aspects of action (karma), devotion (bhakti) and knowledge (jnana). The highest truth about the Self is described in a few verses that are sprinkled throughout the text and many other aspects such as creation of universe, modes of mind, action, renunciation, imbibing godly qualities, shunning demonic qualities etc. are all found in it. Shankaracharya's commentary on it makes it very special too.
It is unfortunate that many consider a "varna" to be the same as "caste". The latter is a degeneration found aplenty in the Indian society whereas the former is simply a way of classifying people based on their occupation.
There is no parallel to the teachings of Gita. In 18 chapters, it covers all aspects of God, universe and individual and also the means of attaining liberation.