Other than abby ocr?

other than Abby ocr is there any ocr is good to use please suggest any ?
thanks in advance!!!

There is also Teserract https://activities.uipath.com/docs/google-ocr and Microsoft ocr https://activities.uipath.com/docs/microsoft-ocr

is both ocr can be used for unstructed pdf ?

OCR engines get available text, both from structured and unstructured formats. So yes, they can be used.