Eduardo Villalobos, a viewer of Simple Video Making YT Channel, has just sent me a freebie to share with you all.
So here it is - a free pack of 8 transitions for FCPX created by Eduardo Villalobos from Neon Panda MX

Eduardo, if you're reading this, thank you so so so much for being so generous and supportive! Connecting with lovely people like you has inspired me to keep doing what I'm doing. And you've reminded me that the more we share, the more we have. Much love from us to you! x

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UPDATE: 

(16 April 2020)

Due to some changes in the latest version of FCPX, there might be some errors while you used this freebie. The problem is now fixed and we've updated the download link. If you've experienced this problem before, please re-download and install the updated version above.
FCPX 10.4.7 or above is required to use this freebie.