For birthdays I use Google contacts / calendar. For stuff related to people I use Google contacts and if the information gets long enough I move it to Trello.

For birthdays I use Google contacts / calendar. For stuff related to people I use Google contacts and if the information gets long enough I move it to Trello. Haven't really had the need though... But come to think of it I think you could probably put together a pretty solid crm with Trello custom fields