Freelancing means working alone. Even though the freelancer is working independently, programs & tools in completing the project is very fundamental.
As a freelancer, here are some of the programs & tools I have been using throughout my career.
Warning: Affiliate links in the first 3 images, would help me keep going.

DreamHost has been committed to WordPress and to its community for over 10 years. It is a top web hosting company recommended by WordPress.org and it is what I trusted for my self-hosted blog.

Mailtester.com is what I have been using in validating the business email addresses I have guessing.
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Hunter.io is one-stop-shop for lead generation marketing. You can use the domain search, email finder, and email verifier in one platform. Check Hunter’s pricing here.

Toggle Track is the time tracking software I am using for my outside Upwork clients. It is easy to manage, you can use tags so you can directly see how much time you spent in one project or task. Check Toggl here.

Invoicely is a simple yet powerful tool that I wish I have known when I started accepting outside Upwork projects. It is hassle free. Check Invoicely features here.

Snagit is a screen capture and recording software that I have been using 2013. The Grab Text feature of Snagit 2020 is my favorite, it can save yourself from days of encoding a text document or screenshot data into Excel or Word. More features of Snagit here.