1. Information on climbs:
Website that states what Cols are open: http://www.sport-passion.fr/parcours/etat-cols.php  (The German http://www.alpenpaesse.co is not always correct!)
The German website: http://www.quaeldich.dehas all information possible about a pass. Even as a non-German speaker, coloring and numbers tell more than any word. Just click on “Pässe” (meaning pass) and search for a specific pass or explore by region. Once you click on a pass and scroll down, you can see the elevation gain, profile and much more in detail.
2. Accommodation
For bike tourists on a budget, try www.warmshowers.org, a free “coachsurfing” website specifically for touring cyclists. I have used that site in New Zealand, Australia, Hawaii and Switzerland and I had always fantastic experiences!
Otherwise, if you stay in a remote ski resort for a week+, they might have a great offer. I stayed in a 3 Star studio apartment in Modane, for 140 Euro/week. (In other places, I paid 50-70 Euro/night for a one person private bed and bathroom)

Download the maps.me app. From there you can download maps for specific regions.
You can also make specific regions offline in Google maps.