Nuklear
This is a minimal-state, immediate-mode graphical user interface toolkit written in ANSI C and licensed under public domain. It was designed as a simple embeddable user interface for application and does not have any dependencies, a default render backend or OS window/input handling but instead provides a highly modular, library-based approach, with simple input state for input and draw commands describing primitive shapes as output. So instead of providing a layered library that tries to abstract over a number of platform and render backends, it focuses only on the actual UI.
 
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Editor

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                 TEXT EDITOR

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Editing text in this library is handled by either nk_edit_string or nk_edit_buffer. But like almost everything in this library there are multiple ways of doing it and a balance between control and ease of use with memory as well as functionality controlled by flags.

This library generally allows three different levels of memory control: First of is the most basic way of just providing a simple char array with string length. This method is probably the easiest way of handling simple user text input. Main upside is complete control over memory while the biggest downside in comparison with the other two approaches is missing undo/redo.

For UIs that require undo/redo the second way was created. It is based on a fixed size nk_text_edit struct, which has an internal undo/redo stack. This is mainly useful if you want something more like a text editor but don't want to have a dynamically growing buffer.

The final way is using a dynamically growing nk_text_edit struct, which has both a default version if you don't care where memory comes from and an allocator version if you do. While the text editor is quite powerful for its complexity I would not recommend editing gigabytes of data with it. It is rather designed for uses cases which make sense for a GUI library not for an full blown text editor.