1. Rentman – A comprehensive rental management system ideal for businesses in industries like AV, construction, and events. It offers features like inventory management, reservations, invoicing, and scheduling.

2. FlexRent – Offers rental software that handles inventory, bookings, and invoicing. It also provides tools for customer management and a flexible, customizable platform.

3. Lightspeed Rental – This platform caters to rental businesses and includes features for point of sale, inventory management, and online booking. It's ideal for businesses in retail and rental industries.

4. Rental Software by Booqable – While you're seeking alternatives, it’s worth noting that Booqable itself is a highly regarded platform for those in need of rental management.

5. Quick Rentals – An easy-to-use software that specializes in rental tracking, payment management, and product availability. It’s great for smaller businesses.

6. EZRentOut – A rental management system that simplifies inventory tracking, order management, and online payments. It's designed for a range of industries, including equipment rental and party rentals.

7. HireHop – Cloud-based rental software designed to manage inventory, track customer orders, and process invoices. It works well for various rental business types, especially in the equipment rental sector.