Trello is very convinient and free web service which helps manage different task and easily organize task cards bettwe
Evernote is awesome app that we use like digital notepad. You can save text, pics, videos and audios.
To keep track of time we use WebDav calendar which you can sinc with Google Calendar, Apple iCal and others. Time is essential, so it is really necessary to keep team organized.
At Warp Games we don't have big team. Actually we have 3 people. So Team management was organised mostly via Skype conversations.