Great EE app for hobbyists and pros – Electronic Toolbox Pro Review

By far the best app for electronics reference. I use it constantly to pull up cmos and ttl IC pin outs - sure beats flipping through the cookbooks. Plus great developer support. And it allows you to customize which topics appear, so can take out PCB trace info, etc. if you don't need it.
Review by 3fred on Electronic Toolbox Pro.