I haven’t been as active working on new Defold libraries in 2019, but some of the libraries I already have available are quite popular and receive bug reports and feature requests that keeps me busy 
Many thanks to all users and to everyone reporting problems or suggesting new features!
Here’s the release notes of libraries with new releases in 2019:
Amazon Gamelift extension for the Defold game engine
Defold-GameLift 2.0.0 [britzl released 2019-02-13]
BREAKING CHANGE: gamelift.init() will no longer automatically invoke ProcessReady(). You need to manually call gamelift.process_ready() after gamelift.init() has finished (and before you have completed any additional initialisation that your server may need)
Defold-GameLift 1.1.0 [britzl released 2019-02-05]
CHANGE: Updated to Gamelift SDK 3.3.0
Simplify input related operations such as gesture detection, input mapping and clicking/dragging game objects
Defold-Input 2.1.0 [britzl released 2019-08-02]
NEW: First version of onscreen.lua for working with virtual on-screen controls
Defold-Input 2.0.0 [britzl released 2019-08-02]
BREAKING CHANGE: The trigger constants in mapper.lua has been moved to the new triggers.lua module.
NEW: triggers.lua contains all input event triggers from all.input_bindings together with functions to check if a trigger is a mouse, keyboard or gamepad event.
Defold-Input 1.6.3 [britzl released 2019-08-01]
NEW: Added constants for the gamepad connect/disconnect bindings
Defold-Input 1.6.2 [britzl released 2019-08-01]
NEW: gamepad_connected and gamepad_disconnected bindings added
Defold-Input 1.6.1 [britzl released 2019-07-29]
NEW: Added cursor constants to Lua module in.cursor
FIX: Better detection of deleted game object before sending cursor events
Defold-Input 1.6.0 [britzl released 2019-06-01]
NEW: The cursor.script will now also generate pressed and release events when pressing outside of a game object
Defold-Input 1.5.3 [britzl released 2019-04-06]
FIX: Improved mouse vs touch control of the cursor
Defold-Input 1.5.2 [britzl released 2019-04-06]
FIX: Improved cursor support on mobile/touch
LuaSec module for Defold
Defold-LuaSec 1.1.0 [britzl released 2019-06-14]
NEW: Android 64-bit support
Orthographic camera functionality for the Defold game engine
Orthographic Camera API 2.9.1 [britzl released 2019-06-06]
CHANGE: Using camera.set_zoom() will now immediately update the zoom level so that a call to for instance camera.screen_to_world_bounds() immediately after a zoom change will return the proper values.
Orthographic Camera API 2.9.0 [britzl released 2019-06-06]
NEW: The camera can now be configured to immediately position itself on the target it is assigned to follow even when lerp is enabled.
camera.follow("/camera", "/target", { lerp = 0.1, immediate = true })
Or:
msg.post("/camera", "follow", { target = "/target", lerp = 0.1, immediate = true })
Orthographic Camera API 2.8.0 [britzl released 2019-03-28]
NEW: camera.world_to_screen() now takes an optional adjust mode. Useful when positioning gui nodes on world coordinates.
FIX: camera.project() didn’t use current window dimensions
Orthographic Camera API 2.7.3 [britzl released 2019-02-13]
FIX: Removed deprecated call to render.draw_debug2d()
Orthographic Camera API 2.7.2 [britzl released 2019-02-07]
FIX: Don’t require a callback function to be specified when calling camera.shake()
Orthographic Camera API 2.7.1 [britzl released 2019-01-25]
FIX: camera.follow() didn’t work properly after changing from explicit arguments to options table
Defold-RichText is a system to create styled text based on an HTML inspired markup language
Defold RichText 5.5.0 [britzl released 2019-06-08]
NEW: Added support for combining words of the same style on a line into a single node to reduce node count. This is achieved by passing combine_words = true in the settings.
Defold RichText 5.4.1 [britzl released 2019-04-17]
FIX: Zero width metrics didn’t apply the word size to the metrics height which results in linebreaks of the wrong height
Screenshot extension for the Defold game engine
Defold Screenshot 1.7.0 [britzl released 2019-06-28]
NEW: It is now possible to capture a portion of the screen in HTML5. Fixes #4
Defold Screenshot 1.6.0 [britzl released 2019-03-22]
NEW: HTML5 support for screenshots using screenshot.html5(cb). Thank you @AGulev and @Jhonnyg!
Defold native extension to share data from a Defold application using native dialogs
Defold Sharing 1.6.1 [britzl released 2019-07-17]
FIX: Crash/conflict with other extension using FileProvider on Android
Defold Sharing 1.6.0 [britzl released 2019-05-21]
NEW: Use of the new manifest merge support in Defold. No need to create your own custom AndroidManifest.xml or Info.plist.
Defold Sharing 1.5.0 [britzl released 2019-03-20]
CHANGE: Updated included AndroidManifest.xml to match the one in /builtins
NEW: Added Info.plist with sharing descriptions
A cross platform asynchronous implementation of the WebSockets protocol for Defold
Defold WebSocket 1.6.0 [britzl released 2019-06-14]
NEW: Android 64-bit support
Defold Profiler interaction using Lua
DefPro 1.1.1 [britzl released 2019-02-15]
FIX: Added fallback when unable to get string
Unit testing in Defold
DefTest 2.7.1 [britzl released 2019-07-22]
FIX: Issue with message formatting when creating an assert
DefTest 2.7.0 [britzl released 2019-03-08]
NEW: Added support for test filtering using the pattern option
Match 3 engine for Defold
Emthree 2.0.0 [britzl released 2019-05-20]
Added diagonal slide mechanic while collapsing and filling the board.
BREAKING CHANGE: emthree.SLIDE_* is now emthree.COLLAPSE_*
BREAKING CHANGE: Config value slide_duration is now collapse_duration
BREAKING CHANGE: Config value slide_easing is now collapse_easing
NEW: slide_duration for controlling the slide (diagonal) animation duration
NEW: slide_easing for controlling the slide easing
NEW: swap_duration for controlling swap animation duration
NEW: remove_duration for controlling the pause duration while removing blocks
Emthree 1.1.1 [britzl released 2019-03-28]
FIX: Prevent swaps with blockers
Defold GUI system
Gooey 7.5.2 [britzl released 2019-07-08]
FIX: Script instance detection didn’t work on all platforms
Gooey 7.5.1 [britzl released 2019-06-13]
FIX: Missing nil check when using new use_marked_text option
Gooey 7.5.0 [britzl released 2019-06-13]
NEW: gooey.input() now has a use_marked_text config value to control if marked text should be used or not
Gooey 7.4.1 [britzl released 2019-06-01]
FIX: Static list item positioning broke in the previous release
Gooey 7.4.0 [britzl released 2019-05-28]
NEW: Horizontal list support. Thank you @paweljarosz !
Gooey 7.3.4 [britzl released 2019-05-24]
FIX: Crash in certain circumstances when setting text on input field
Gooey 7.3.3 [britzl released 2019-05-24]
FIX: Marked text when typing on device will get discarded if you click outside of the input field so that it loses focus
Gooey 7.3.2 [britzl released 2019-05-24]
FIX: Input text now properly handles UTF8 characters when calculating max length
Gooey 7.3.1 [britzl released 2019-05-22]
FIX: Don’t accept a list item press if the list has scrolled.
Gooey 7.3.0 [britzl released 2019-05-22]
NEW: It’s now possible to detect a long press on most components via the long_pressed state variable. The long press minimum duration can be configured via the set_long_pressed_time(time) on the component instance.
Gooey 7.2.3 [britzl released 2019-05-22]
FIX: Issue with set_visible for scrollbars
Gooey 7.2.2 [britzl released 2019-05-05]
FIX: Issue since upgrade of LuaJIT in Defold
Gooey 7.2.1 [britzl released 2019-04-22]
FIX: Defold 1.2.151 changed the way the script instance was set on the global table. This caused problems with detection of script/scene reload. This has now been fixed by using the new numeric script instance key.
Gooey 7.2.0 [britzl released 2019-04-15]
CHANGE: Lack of dynamic list item data is now returned as nil instead of an empty string
Gooey 7.1.0 [britzl released 2019-03-26]
CHANGE: Handle size is taken into account when calculating scroll amount as well as handle position. The handle will now stay within the scrollbar bounds.
FIX: scroll.y was inverted for both the scrollbar and list component. 0 should be at the top of a list while 1 should be at the bottom.
Gooey 7.0.2 [britzl released 2019-03-21]
FIX: List initial scroll is 1
FIX: Need to initiate scrollbar values even if no action is provided
Gooey 7.0.1 [britzl released 2019-03-18]
FIX: Removed debug print
Gooey 7.0.0 [britzl released 2019-03-18]
NEW: gooey.scrollbar()
NEW: Lists now have a scroll_to(x, y) instance function
BREAKING CHANGE: The lists in the Kenneyblue theme now supports scrollbars via an optional scrollbar id as the second argument.
Gooey 6.6.1 [britzl released 2019-02-07]
FIX: Fixed a crash in the input field if the config was nil
Gooey 6.6.0 [britzl released 2019-02-07]
NEW: Text fields can now define a range of allowed characters using Lua standard pattern matching. Example:
gooey.input("input_alphanumeric", gui.KEYBOARD_TYPE_DEFAULT, action_id, action, { allowed_characters = "[%a%d%s]" })
Defold template project for LOWREZJAM
LOWREZJAM-template 1.3.0 [britzl released 2019-02-02]
CHANGE: The render script now accepts not only the view but also the projection from an active camera
LOWREZJAM-template 1.2.0 [britzl released 2019-02-01]
NEW: Added preset templates for Lowrez jam and Nokia 3310 jam
LOWREZJAM-template 1.1.0 [britzl released 2019-01-26]
NEW: It is now possible to adjust low-res texture size
NEW: Merged upscale material and other settings
LOWREZJAM-template 1.0.1 [britzl released 2019-01-26]
FIX: Didn’t set the right blend state in the render script
Utilities for game development using the Defold engine
Ludobits 6.6.0 [britzl released 2019-05-10]
FIX: sequence.http_get() and sequence.http_post() didn’t work
NEW: sequence.call() to invoke any function
Ludobits 6.5.2 [britzl released 2019-04-23]
FIX: ludobits.m.signal Signal id should be of type hash for easier use when sent as a message id
Ludobits 6.5.1 [britzl released 2019-04-23]
FIX: ludobits.m.signal trigger() failed for listeners added as URLs when the message was anything other than a table or nil
Ludobits 6.5.0 [britzl released 2019-04-21]
NEW: sequence.go.animate() now supports “position.xy” as a property
Ludobits 6.4.0 [britzl released 2019-04-13]
NEW: ludobits.m.sequence
Ludobits 6.3.1 [britzl released 2019-04-02]
FIX: Delete flow timers when done
Ludobits 6.3.0 [britzl released 2019-04-01]
CHANGE: flow.update() has been deprecated in favour of updating flows using a native timer
CHANGE: flow.ray_cast() has been deprecated in favour of native physics.raycast()
Monarch is a Defold screen manager with transition support and a straight forward API
Monarch 2.19.0 [britzl released 2019-08-01]
NEW: It is now possible to post a message to a screen using monarch.post(screen_id, message_id, [message]). For proxy screens the message will be sent to the Receiver Url defined on the screen_proxy.script. For factory screens the message will be sent to all game objects in the collection.
Monarch 2.18.0 [britzl released 2019-07-29]
NEW: GUI transitions now supports multiple nodes if needed
Monarch 2.17.2 [britzl released 2019-05-02]
FIX: Fixed incorrect scope of variable in monarch.show()
FIX: Reloading a screen could cause problems with screen unregister/register flow
FIX: More error reporting
Monarch 2.17.1 [britzl released 2019-03-17]
FIX: Focus lost messages were not received before the screen was unloaded
Monarch 2.17.0 [britzl released 2019-03-08]
FIX: It was not possible to call monarch.show() on a screen that was preloading (via monarch.preload() or the Preload setting). Fixes #40.
NEW: monarch.is_preloading(screen_id)
NEW: monarch.when_preloaded(screen_id, callback)
Monarch 2.16.3 [britzl released 2019-03-04]
FIX: It wasn’t possible to reload a preloaded screen
Monarch 2.16.2 [britzl released 2019-01-23]
FIX: Wait for popups to close before transitioning.
Monarch 2.16.0 [britzl released 2019-01-11]
NEW: Added a Preload option to screens. Preload will automatically preload the screen and keep its resources in memory.
NEW: Added monarch.unload(id, [cb])
NEW: Added monarch.is_visible(id)
Defold platformer engine
Platypus 3.2.2 [britzl released 2019-08-02]
FIX: Bounds calculation for left and right raycast was wrong, causing inconsistencies when detecting wall and ground collisions
Platypus 3.2.1 [britzl released 2019-08-02]
NEW: It is now possible to define a collision offset. This can be used to handle when the collision object isn’t centered around game object origo.
Platypus 3.2.0 [britzl released 2019-03-25]
CHANGE: Better support for handling slopes
FIX: Adjust for game object bounds when the parent/ground is removed underneath
Steamworks support for Defold using the Defold extension system
Steamworks 1.2.0 [britzl released 2019-02-22]
NEW: Added dynamic libs for Linux
Steamworks 1.1.0 [britzl released 2019-02-12]
FIX: Platform detection wasn’t done correctly.
FIX: Several smaller fixes to the generated code
I’m having an impression that I’m not the only one working on my game, when there are so many stuff shared by people to use 
I’ve recently posted 
If you need something more than tile collision for physics, I think Platypus is the way to go. Or you have to add needed features yourself on top of TTC.