For the validation of the transcript you may use a simple text viewer / editor together with a general purpose sound editor, e.g. Praat6.4, Cool Edit etc. The sound editor should be capably loading the original signal files of the corpus and replaying selected portions of the signal. Do not use software that plays only the total utterance.
The validation of annotations usually requires specialized tools which should be provided by the producer of the corpus. If this is not the case, we recommend Praat as a very good tool for basic segmentations, prosodic tagging etc.