MIT has a subscription to Planet satellite imagery.
Get an account:
With an account you get access to the following data:
It also includes full access to the Data API and Orders V2 tools (including clip and ship - which allows users to clip their AOIs to a geometry). Data are available at a 3m to 5m resolution, depending on location.
Accounts include an annual download quota of 10,000 km2. If you reach the quota, email us and we'll let you know if we can increase it. Note that certain imagery, such as Landsat, MODIS, etc. are available from the free sources listed below and we recommend using these sources instead of Planet so you don't use your quota.