Kaizena - Fast, high quality feedback on student work. Both teachers and peers can access student work (Google Drive only) and leave voice-recorded feedback to the creator. Tracks skills over time. Free.
Formative - Intervene in the moments that matter most. Teachers post questions, and students respond via text, multiple choice and drawing; teachers can see responses and comment immediately through the dashboard. Free.
Literably - The easiest way to assess oral reading and comprehension. Replaces the traditional means of administering running records. Students read and voice-record text, teachers get feedback on fluency and comprehension. Results post to teacher the next weekday morning. Free trial of 10 per month. Since the recordings are human scored, there is a cost for this service. Soon they will release Literably Practice, which allows students to record and listen to themselves to improve fluency.