What are quality Bootstrap 4 input form Components? - datepicker, input mask, range sliders, charts .....

I'm developing a Bootstrap project and started out with a UI kit theme but found that tweaking it was an issue, so I'm now using standard-issue Bootstrap.  My question is what or where are recommended/best form UI Components?  I've researched, but am not sure which are quality ones, so recommendations or a guide to resources is appreciated.   I usually use Foundation, and this project is also new to me as it is financial and has dates, amounts, percentages and charts.

I'm using the current Bootstrap version as it is today at https://getbootstrap.com/.

  <!-- Bootstrap CSS -->
  <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.2.1/css/bootstrap.min.css" integrity="sha384-GJzZqFGwb1QTTN6wy59ffF1BuGJpLSa9DkKMp0DgiMDm4iYMj70gZWKYbI706tWS" crossorigin="anonymous">

  <!-- jQuery first, then Popper.js, then Bootstrap JS -->
  <script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script>

  <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.6/umd/popper.min.js" integrity="sha384-wHAiFfRlMFy6i5SRaxvfOCifBUQy1xHdJ/yoi7FRNXMRBu5WHdZYu1hA6ZOblgut" crossorigin="anonymous"></script>
 
  <script src="https://stackpath.bootstrapcdn.com/bootstrap/4.2.1/js/bootstrap.min.js" integrity="sha384-B0UglyR+jN6CkvvICOB2joaf5I4l3gm9GU6Hc1og6Ls7i6U/mkkaduKaBhlAXv9k" crossorigin="anonymous"></script>


UI components of interest are:
  date picker - one date picker and also start date with end date
  input mask - things like date, apply dollar sign and decimals to amounts, phone numbers
  range input slider if there is an improvement over the Bootstrap ones
  begin and end range input slider - dates, amounts, numbers
  charts, doughnut, pie, line and so on
  and any other "gems" to have in the toolbox

Thank you.