need to develop or to use already written (github) modules.
1. email newsletter (user part: subscribe, get selected newsletter, ability to unsubscribe via link in email; admin's part: create/edit newsletter, create/edit issues, define date of delivery, delivery according to the schedule)
2. tests constructor (user part: complete test, enter email, get the result via email. admins part: construct test (option list, check boxes, text field), define the result based on points)
cost? time? suggestions about already existing modules?