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Alex - Bojan's list is a good place to start - but be aware that 3D CAD can be a pretty steep learning curve if you don't have a background in Engineering design / drafting.
I'm currently using OnShape, which is free for hobby users - if you are prepared to share all of your designs with other users. That works for me (I'm a big fan of the open-source "Maker" movement), but won't suit you if you want to develop a secret world-changing invention. You'd probably want a CAD system that allows your files to remain your property on your own hard-drive, rather than being stored "in the cloud". Something like TinkerCAD might be a better option if you're a beginner, and want full control / ownership over your designs.
Another thing to consider is that 3D Printing is only one of many manufacturing technologies, which all have their place. For thin flat parts, laser cutting may be a better option; for mechanical strength, CNC Machined metal parts could be considered; casting is still a great option for many applications; and so on.
Desktop 3D Printing is great where plastic is the "right" material, and for general "rapid prototyping" of all sorts of designs, but may not be the best option for "production" of the finished design.
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