It's a selectize multiselect. With bulma.
See the Pen by i_cant_rap (@i_cant_rap) on CodePen.
Tree multi-select (jsTree)
Industry/Category Multi-Select Dropdown B 14012
Multi select cards
Multi-select jQuery UI calendar
Selectionator
Chosen Multi-select
Better Multi-Select List in Vue.js
Multi Select Menu Demo
Select to Multi-select Dropdown
Mobile Multi-Select Dropdown Menu
Bootstrap Multi Select Date Picker
Accessible Multi-select List
Bootstrap Forms
jQuery Multiselect Filter
Kendo - MultiSelect
Multiselect drag
Multiselect pure JS
jQuery-UI MultiSelect Widget testing
MultiSelect Angular Directive
Bootstrap MultiSelect
React Checkbox MultiSelect
Multiselect
selectize multiselect with bulma
jquery Multiselect test
Multiselect from Dropdown
Multiselect Dropdown Filter with Search
Multiselect snippet
Multiselect (dropdown)
multiselect
Multiselect Web Component
A multi-select dropdown.
Multiselect Dropdown
Multiselect Checkboxes
Campsite Registration