Are there benefits when purchasing a yearly subscription?

Hello good day!

I'm Jefferson, I'm from Brazil, I recently started using your system, to generate forms within the code of my site, I would like to know about annual plans and what advantages I have in paying since I use it for free, another and the main doubt What do I have, do I have to pay for your plan? Will I be able to generate non-Jot forms? would be the most interesting

You're currently under the free plan so you have not been charged so far, you can also check your current plan and limits following this guide: https://www.jotform.com/help/408-Understanding-Your-Account-Usage-and-Limits 

You will also find more information about our plans and limits on this link: https://www.jotform.com/pricing 

Please note that purchasing a yearly and bi-yearly subscription has already a discount compared to pay the monthly fee during one or two years. 

Will I be able to generate non-Jot forms?

I'm not sure what you're referring to with this info, but you may use our forum builder to create forms, if you need to further customize the form you may get the source code. 

https://www.jotform.com/help/104-How-to-get-the-Full-Source-Code-of-your-Form 

I hope this helps.