Any 91's not drafted last year have a chance to get drafted this year?

not u. y r u gettin ur hopes up wasnt it hard enough goin through the whole day waiting to c ur name last year

Some 91's will get drafted this year. Many undrafted 91's can and will make the OHL at some point (usually as a walk-on). If you think you have what it takes to play in the OHL and are undrafted you need to do some homework. After the OHL draft target some teams (usually the re-building teams) that may need help at the position you play and contact them to see if you can get a walk-on invite to their camp. If you have an agent, better still since they will have contacts and can get you a tryout. Or play Tier 2 for a year and try again as an 18 yr old. There are many good players in the OHL who have never been drafted to the league.

And there are many who were drafted last year and are right off the map.

OHL teams can have a maximum of 50 players on their protected list.. this would be comprised of:
1) players on their current roster
2) players who they have drafted over the past couple of years.

As players are not put on the roster - they eventually are dropped from the protected list. So if they draft you and do not develop to the point where they think you will never make their team, you are removed from their list.

where can you find this list ?

You can't - it is property of the OHL and the teams.