Auto billing software for small businesses?

I’m a freelance accounting professional and I work with a lot of small retailers and traders. One common problem I see is billing still being done in Excel or manually, which becomes difficult once sales start increasing.

So recently some clients have been asking about auto billing software that can handle invoices, GST and basic inventory automatically.

In many shops I’ve worked with, I’ve seen Busy accounting software used quite a lot for billing and stock together. Some businesses still stick with Tally, and a few are trying cloud tools.

Just curious what others here are using as auto billing software for their shop or small business. What has worked well for you in daily billing?