There’s:

• 2ping <https://www.finnie.org/software/2ping/>

• fping <https://www.fping.org/>

• hping <http://www.hping.org/>

• nping <https://nmap.org/>

• oping <https://noping.cc/documentation/oping/>

There’s also qping, tping and rping, but they are not implementing ping functionality, but are tools for checking the status of specific remote services.