There are many free invoicing softwares, among which the most famous ones are Butler Pioneer Edition and Kingdee Wisdom. Because I need to print and support the function of scanning gun besides the basic function of purchasing, selling and storing, and it is also a small business. I need all the functions to be free for life, so I finally got the housekeeper's creative edition to use. From April 13 to now, I really feel that using software is much better than manual bookkeeping. And I'm not that tired myself.