Google Maps APIs

Add maps and location info to your website with Googles various mapping and location APIs. They've got an API for maps, location, distance, places, directions, and more. Their APIs allow you to automate your workflows using your favourite language with REST calls or client libraries.

Sendgrid - Email Services

Integrate email functionality into your web applications with SendGrid's email API. If you need to validate email addresses or send out newsletters, SendGrid delivers. They offer a free tier.

MX Toolbox

Test MX records for a domain in priority order with this handy tool. When verifying domain ownership sometimes you need to edit the MX record of your domain. Use this tool to test before you submit your verification.They also have diagnostics which will connect to the mail server, verify reverse DNS records, perform a simple Open Relay check and measure response time performance. You may also check each MX record (IP Address) against 105 DNS based blacklists . (Commonly called RBLs, DNSBLs)

Hurricane Electric - Free DNS

Welcome to the Hurricane Electric Free DNS Hosting portal. This tool will allow you to easily manage and maintain your forward and reverse DNS. Features include: - Dualstack: Supports queries via both IPv4 and native IPv6. - Support for A, AAAA, ALIAS, CNAME, CAA, MX, NS, TXT, SRV, SSHFP, SPF, RP, NAPTR, HINFO, LOC and PTR records. - Smart mode IPv4 and IPv6 reverse zones simplifies reverse zones. - Slave support - Multiple reverse zone formats: Standard, RFC 4183, RFC 2317, DeGroot. - Geographically diverse servers. - Sanity checking for delegation for both forward and reverse zones. - Basic syntax checking for fields. - Multiple domains per account.