ServerSelectorX Premium is open source and has Jenkins.
Links:
1.13+:
Source code: https://github.com/ServerSelectorX/ServerSelectorX/tree/master
Jenkins: https://ci.rkslot.nl/view/ServerSelectorX/job/ServerSelectorX Premium/
1.7.10 - 1.12.2:
Source code: https://github.com/ServerSelectorX/ServerSelectorX/tree/premium-legacy
Jenkins: https://ci.rkslot.nl/view/ServerSelectorX/job/ServerSelectorX%20Premium%20legacy/
Connector:
For spigot/paper: https://ci.rkslot.nl/view/ServerSelectorX/job/ServerSelectorX-Connector/
For sponge: https://ci.rkslot.nl/view/ServerSelectorX/job/ServerSelectorX-Connector%20Sponge/
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