BedWars1058-WinStreak add-on allows your players to achieve winning streaks while playing on your server.
You can use the variables in any plugin that supports PlaceholderAPI to display the player's streak.
Using DecentHolograms + AjLeaderboards to create a leaderboard of streaks.
You can start contributing to the project by creating your own fork.
For developers, they can make improvements to the code and submit their pull requests
You can still contribute by reporting bugs so they can be fixed.