Note that you may need to look up sites that are more appropriate for your operating system or are current compared to these links.
You'll need a PayPal account to make payments.
You'll need a Skype account for the Skype software.
You'll need the Skype software to meet on the internet for your tutoring appointments.
You might need Adobe Reader. This allows you to view PDF's that you may be sent in the course of the tutoring. Be sure to download the correct software for your computer.
You might want to use screen picture capture software such as Grab which is generally on all Macs, or the Snipping Tool or the newer Snip & Sketch on Windows systems.
You might want to use screen video capture software such as SnagIt for Windows or Macs. I'm not sure how well this would work for you in recording a tutoring session. If you try this, please let me know how it works out for you.
You might want to have spread sheet software on hand such as Excel or Google Sheets. This could be useful in Reimann sum calculations or statistics for example.
If you have a mac, you should have a copy of Grapher software already. Pacific Tech's Graphing Calculator is available for both Windows and Mac. Although only a 2-D graphing calculator, the Desmos calculator is free. Geogebra Graphing Calculator is also free but can graph 2-D and 3-D. These graphing calculators are generally useful over a number of topics and are typically more useful than the TI's graphing calculators.