Tools such as Zoho One, Odoo, and Trello + Wave are great options for small businesses that are really good works depending on your needs. If you need an affordable and all-in-one solution for invoicing, CRM, and team management, then Zoho One is the right choice for you. In case you want more control, Odoo is the perfect option as it is flexible and scalable. Also, if you are looking for a simple and budget-friendly way of scheduling, task tracking, and invoicing, then using Trello in combination with Wave will suit you best. Therefore, I would advise you to make a decision based on how intricate your operations are and how much customization you require.