The best alternatives to Accelerator Keys are Media Atelier, Keysmith, and Button Shortcuts. If these 3 options don't work for you, we've listed a few more alternatives below.
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Agree.com— Free e-signature for everyone with invoicing and payments!
Using GrandTotal you can create invoices and estimates in the twinkling of an eye and keep track over the outstanding payments. Detailed statistics and graphs give you an insight into the current state of your business and allow comparison to previous periods.
ShortieCuts is a Chrome Extension that lets you use Excel-style shortcuts on Google Sheets, such as ALT-key shortcuts, Trace Formulas + F5 to return, various CTRL-key shortcuts, and includes a Goal Seek add-in.