The following services are those that we use and recommend. Some of these are also affiliate links.
CRM and marketing tools
PipelinePRO: Another CRM with lots of features
Register Your Domains Hassle-Free with Namecheap
Get Business Email accounts for your domain! As low as 91 cents per month!
If you purchase Namecheap Private Email with the above affiliate link, I will move your email to it for free!
An alternative for email hosting is Google Workspace.
3D Web Development
I use and recommend DigiWorldz for Opensimulator hosting.