There’s no clean way to pigeonhole Airtable. It is technically a database, but can be used for data visualization, project management, task management, calendars, and planning. All of these tasks work better in Airtable if you store your data (customers, email subscribers, financial metrics) there, because any tasks, projects or events can be linked to assets.
GnuCash is free, Linux-based accounting software that has all the features small businesses need to manage their finances: income and expense tracking, double-entry accounting, financial reports and calculations, scheduled transactions, statement reconciliation, and more. It can also track bank accounts, stocks, bonds and mutual funds. In addition to Linux, GnuCash is also available for Windows, Mac and Android devices. gnucash.org
Paying bills isn't as much fun as sending out invoices, but it has to be done. You may already be managing this task through your bank's website, which may or may not excel at this service. There are few other options online for standalone bill-pay, and the ones that exist have restrictions. Bill.com rules when it comes to supporting both invoices and bills; you'll be charged $29 per user per month for payables automation only. If that's more than you want to pay, you could subscribe to Wave, which is free, and just use its bill-paying tools.
This article uses the term “tester” to refer to the person involved in testing software with automation tools. It is not meant to distinguish by job title or technical proficiency. Jim Hazen describes himself as a hybrid, or “technical tester,” because he can write test scripts and develop what he refers to as “testware.” The trend is to hire for multiple skillsets, but that does not mean the non-technical stakeholders involved in software development don’t benefit from automation testing.