There are mainly three variations of Tara devi. ugratara, ekajata, neelasaraswati. the mantras also variations of above given mantra. there is famous vidyarajni also of neelasaraswati. but in buddhist vajrayana Tara sadhana is very famous and highly developed. they have 24 variations of Tara . In these variations saraswati, trailokya vijaya etc are included. I don't know if these variations are practically anga vidyas of Tara? or Tara herself? sage vasishtha recovered Tara mahavidya from then mahachina present Tibet. so Tara mahavidya sadhana is called chinachara. please give positive inputs on Tara mahavidya. if any follower of this forum have any relevant information.