Many Universities have Pre-application forms (Electronic or by email). You can submit details like GPA; Courses completed, GRE, TOEFL Scores, Research interest, a brief introduction about yourself, etc. It provides useful information about your profile to the admission committee. There are no fees for pre-application, and official transcripts and letters of recommendation are not required. If admission committee like your profile they will encourage you to apply officially!
Pre-Application Forms for some Programs: