Most of the EU satellite stuff is open licensed, lookup Sentinel II. Various wavelengths and new data every 5 days (so if it's cloudy you can try again).
It's not the most user-friendly though, you have to download large swathes at a time.
NASA Landsat program is a great example of Open Data. It's important to remember that US taxpayers funded the creation, launch and operation of the satellites. EU Sentinel is similar. So the imagery is paid for, as users we just don't have to pay twice.
DigitalGlobe's GeoEye-1 was also partially funded with taxpayer money in exchange for unlimited military access and exclusive use of the highest resolutions. It is time the general public got to reap the benefits too.
It's not the most user-friendly though, you have to download large swathes at a time.