Every day when I was coaching at the collegiate level I would have the team warmup, stretch, etc. then I would break them off into what we called drill series. Pitchers work on foot work, picks, pfp's. Catchers work on foot work, blocking, popups where I stand behind them, hit the ball up, and they have to locate the ball, clear the mask, and turn to the proper position to catch the ball, also have them in their stance, stand behind them roll a ball in front, left, right side of them and have them find the ball, call inside or outside, and throw the ball to first. Another good drill I do for blocking with the catchers is stand at the mound, have the catcher in their stance, and hit fungo's at them. This drill is amazing, and gets the fear of being hit with the ball out of them very quickly.
For infielders, 1st basemen together, middle infielders together, and 3rd basemen together. Start with their gloves off, work on rollers fielding from the ground up, coming through the ball, proper foot work, staying low and firing a strike to 1st base. Also working on flipping the ball in the DP situation, pivots, working on always keeping the feet moving at the bag, work on slow rollers coming in, balls in the hole with your backhand, and balls up the middle. 3rd Baseman work on fielding the slow roller, charging the ball and throwing on the run, work on backhand, work on read and react bunts.
Outfielders work on balls over the shoulder to the left, and right. Work on pursuit angles, crow hops, coming through the ball, fielding the ball on the lines, etc..
These are just a few little things I had my guys do.