PHONE APPS
City Mapper
Transportation in Paris : RATP
Open Markets in Paris : Marchés de Paris
To avoid food waste : Too Good to Go
To fill up water bottle : Fontaines de Paris
ON LINE TICKETS BOOKING
Some sights visits have to be planed 8 to 15 days in advance to ensure availability and avoid (too long) queuing:
https://www.toureiffel.paris/en
http://en.chateauversailles.fr/plan-your-visit/tickets-and-prices
https://www.louvre.fr/en
http://www.paris-arc-de-triomphe.fr/en
GUIDE
https://www.unjourdeplusaparis.com/en
https://www.timeout.com/paris/en/things-to-do/city-guide
https://en.parisinfo.com/what-to-see-in-paris
https://parismap360.comhttps://www.baladesparisdurable.fr
TRANSPORTATION
https://www.ratp.fr/en
https://www.velib-metropole.fr/en_GB/service
https://en.lecab.fr
https://www.cityscoot.eu/en/paris/
https://www.parkopedia.com
RESTAURANTS
Restaurants :
Online reviews : https://www.tripadvisor.fr/Restaurants
Online reviews and booking http://www.thefork.com/
SMARTPHONE APPS
Offline city Guide: http://www.tripadvisor.fr/apps-icityguides
Subway and Buses : http://www.ratp.fr/fr/ratp/c_21130/application-ratp/
LUGGAGE STORAGE
https://www.nannybag.com/en/luggage-storage
https://atthecorner.fr/reserver.html?place=Paris,%20France
https://www.eelway.com/en