3DPrinting software totally depends on what kind of equipment you own, it also depends on what type of modelling you will be doing.
For personal modelling you can use Fusion 360 (personal), this is a free software package which is really intuitive and has plenty of tools to help get you started.
For commercial use Fusion 360 is also great, SolidWorks is fantastic too! However these come at a cost of £2,000+ per year.
If you own an iPad or iOS device there are is a good range of design software packages you can use, our most recommended is Shapr with a basic plan for free and a paid plan for £240 a year.
Hope this helped!