I want to shoot 2-D stop motion movies with an overhead camera rig.

Specifically for pencil and paper animation (with the ability to shoot 3D Stop Motion animation) there's MonkeyJam.

For 3D Stop Motion (in order of complexity/cost):

• qStopMotion - Super simple, Linux/Windows. Free.

• stopmotionpro - Audio, Onionskinning, Chromakey, Rotoscope, Looping, etc. Pay or Subscription.

• Stop Motion Studio - Onion, Grid, Edit, Auto, Zoom, Title, Upload Social Media. Free + In-app purchases.

• iKitMovie - Many features. $100.

• The Helium Frog Animator - Many features, Lip Sync. Free.

• AnimatorHD - Lots of features. 4 versions from $30 to $300.

• DragonFrame - Includes professional features like DMX lighting control and camera motion control. Full version with Controller $300, DMX Controls add $250 to $3K.

For what you're doing a dedicated work area with a good table and a Rostrum camera are a must.

What would really be helpful is to find software that will subtract the color of your hands from your view, making your hands see-through so you can see the prior frame and a floating pencil over the last drawing; I did not spot such a feature on any available software, perhaps Green Screen and rubber gloves could accomplish this.