There is multiple software available in the market which you can purchase but when it comes to a single suit that has multiple applications- Microsoft office comes to mind. You can download the office set up from the official website office.com/setup. Microsoft offers different packages to users according to their requirements and every package costs different. The three categories are-
MS Office for Home
MS Office for Business(big or small)
MS Office for Education(School and college)
However, the best part is, the setup is compatible with almost every device be it a laptop, desktop, mobile, or tab and irrespective of the operating system you are using. You can use the office set up effortlessly.