
Thanks to the popularity of the
CSS framework Bootstrap , a lot of different add-ons have been developed for it. Even now you can use Bootstrap for almost any task when developing and designing a website.
For the article I picked up the most useful additions "for all occasions".
Component Sets
Fuel ux

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An excellent set of additional controls, which are often not enough when working with Bootstrap. It includes such modules as trees, patterns, datapicers, wizards, etc.
WebsiteGithubX-editable

I think this is an indispensable set of components for inline editing. It supports various versions of Bootstrap and works fine without it (on jQuery).
WebsiteGithubJasny

A small set of additional items to Bootstrap. Included as a side menu, function buttons, input masks, etc.
WebsiteGithubBootstrap Form Helper

Another interesting set of items. The premium version includes elements such as input for selecting currencies, countries, time zones, languages, etc.
WebsiteGithubLeapstrap

A set of elements to support the
Leapstrap controller plugin. This is a rather unusual thing, so I include it in this list.
WebsiteGithubIndividual components
jQuery Bootpag

An additional component, which is often lacking in the standard set of Bootstrap - Pagination. A special feature is the possibility of dynamic processing.
WebsiteGithubTocify

Component to track page content. Very often this component is missing for creating modern websites.
WebsiteGithubBootstrap Link Preview

Small and very easy to use component for previewing content by reference (like a Facebook preview).
WebsiteGithubFlippant.js

A small script to create "bilateral" blocks. Ideal for creating forms, portfolio cards, etc.
WebsiteGithubBootstrap Tour

A great addition to Bootstrap, which allows you to create a step by step tour for new visitors to your site.
http://bootstraptour.com/https://github.com/sorich87/bootstrap-tourBootstro.js

A variant of the previous tool. It is also designed to create a turn-based tour for your website or web application.
WebsiteGithubYet Another MegaMenu (YAMM)

Component required by almost any modern site. Allows you to create the main navigation menu of almost any complexity.
WebsiteGithubDropdown Menus Enhancement

Addition to the standard menu Bootstrap. Includes features such as menu positioning, display in the menu radio and checkbox-input and more.
WebsiteGithubBootstrap Tree View

A simple solution to display a tree structure. This component supports standard Glyph-icons.
GithubGTreeTable

Another addition that allows you to create a tree structure. It features an abundance of functionality: Drag & Drop, editing, etc.
WebsiteGithubBootstrap Star Rating

Component for easy rating creation, easy to customize. From experience I can say: very often you have to look for a similar component.
WebsiteGithubGridmanager.js

Content editor based on the rows and columns of the Bootstrap framework. Not yet found how to put into practice. Laid out more, as an example of implementation.
WebsiteGithubForm Components
Bootstrap Tags

Component for easy tag creation. Very easy to use and customizable too. Works with all versions of Bootstrap.
WebsiteGithubBootstrap Switch

Component to create neat switches. Suitable for any site design, besides all parameters are easily adjusted here: dimensions, animation, color, etc.
WebsiteGithubBootstrap Maxlength

A good "limiter" for text input fields. Easy to use, sometimes just an indispensable addition.
WebsiteGithubBootstrap Select

A very lightweight component that allows you to significantly expand the functionality of a regular list. Follow the link below to see all usage examples.
WebsiteGithubChosen

A very simple script to significantly improve the combo box. Supports many options and variations for using this field.
WebsiteGithubBootstrap Multiselect

Another option to expand the list box. This script handles events when opening / closing / selecting, etc. You never know what the client will ask ...
WebsiteGithubBootstrap Validator

An indispensable component when working with forms in the Bootstrap framework. It saves a lot of time: in addition to checking, it contains ready-made design of form fields.
WebsiteGithubjqBootstrapValidation

Another component (option) for form validation on the Bootstrap framework. It contains a large number of options for creating validation of user input.
WebsiteGithubjQuery File Upload

A good component that allows you to significantly save time if you need to add a field to download files. Supports multiple server platforms.
WebsitGithubBootstrap Tag Autocomplete

Component for easy autocompletion creation. Very easy to use and lightweight (by weight) script. I think it is worth adding tools to the piggy bank.
WebsiteGithubTag Manager

Ready script (component) to create tags. A lot of options and, accordingly, the possibilities of use.
WebsiteGithubTypeahead

Component for auto add-on with text box. Two scripts are used (for search and display), which can be used both together and separately.
WebsiteGithubSlider for Bootstrap

Another element that helps the user save a lot of time. Instead of entering data manually, simply drag the slider. Many options, fully styled.
WebsiteTokenfield for bootstrap

Component for easy tag creation. Fully stylized, has many options. Supports both keyboard and clipboard input.
WebsiteGithubLabel in place

Easy script to create an unusual effect of combining a label element with an input field. It has many options. Sometimes it may even be useful :).
WebsiteGithubStrength meter

Component to determine the complexity of the password entered. A simple solution for a common problem. Includes many options and ready-made design.
WebsiteGithubBootstrap File Input

Component for downloading files. Supports multi-boot and preview illustrations. Follow the link below to see examples of implementation.
WebsiteGithubLadda UI for Bootstrap 3

Quite an interesting idea using the load indicators directly on the buttons.
WebsiteGithubThere are really a lot of additions to the Twitter Bootstrap framework. Even while writing the article, I continued to find interesting add-ons that would greatly help in a given situation.
Date & Time Pickers
DaterangepickerWebsiteGithubBootstrap TimepickerWebsiteGithubClockfaceWebsiteGithubBootstrap DatetimeWebsiteGithubBic_CalendarWebsiteGithubColor pickers
Pick a colorWebsiteGithubColorpicker for BootstrapWebsiteGithubColor paletteWebsiteGithubEditors
Bootstrap MarkdownWebsiteGithubBootstrap WYSIHTML5WebsiteGithubSummernoteWebsiteGithubTables
TableclothWebsiteGithubBootstrap TableWebsiteGithubMedia & Galleries
Bootstrap LightboxWebsiteGithubBootstrap Image GalleryWebsiteGithubBootstrap Icon PickerWebsiteGithubDialogs & Notifications
Bootbox.jsWebsiteGithubBootstrap ModalWebsiteGithubBootstrap NotifyWebsiteGithubBootstrap ConfirmationWebsiteGithubBootstrap GrowlWebsiteGithubAt the moment, these additions seemed to me most useful in working with the Bootstrap framework. They will help to save time in a particular project.
I hope you enjoyed my collection. If you use other add-ons and would like to include them in this list, describe them in the comments, I (and, I think, to most readers) they may also be useful.
Dmitry KabakovWordPress Developer