BillGrid.com - BillGrid is an easy to use online invoicing, billing and expense management system that will save you time with tracking clients projects, expenses, invoices and payments.

Microsoft Office Excel - Microsoft Office Excel is a commercial spreadsheet application.

ChargeOver - ChargeOver automates recurring billing, subscription billing, & payment acceptance. A SaaS that integrates with Xero, Quickbooks, & has an API. Free trial.

Google Sheets - Synchronizing, online-based word processor, part of Google Drive.

MinuteDock - Web-based time tracking software designed to integrate with the Xero accounting package.

Apple Numbers - Numbers lets you build beautiful spreadsheets on a Mac, iPad, or iPhone — or on a PC using iWork for iCloud. And it’s compatible with Apple Pencil.