In fact, it's a simple applications catalog with experimental extension for Symbian^3's Java Runtime that makes direct system calls to java installer, giving ability to install and uninstall apps bypassing the browser, obtain list of installed apps and their versions.
Before installing an extension make sure Open4All patch is enabled.
nnhub itself will be updated in future, it will contain new apps and their latest versions.
Open for suggestions of your own developed apps in chat: t.me/nnmidletschat

It was a little late for april fools day i guess

nnhub update v0.5

Launching apps now works on Series 40 v3-v6 (feat. @x726564)
Extension is now available for Symbian 9.3-9.4/S60v3.2-S60v5
Support for adding Symbian native applications
Apps compatibility checking system

Recently added:
Kutegram, mobapp-game editor

nnhub should update itself via OTA, otherwise:
Download link: http://nnp.nnchan.ru/nns/nnhub.jar

KEmulator nnmod update v2.15.2

Improved M3G textures debugging in MemoryView (contributed by rmn20)
Added MascotCapsule textures in MemoryView
Fixed suspend/resume
Fixed ticker rendering on Canvas
Added option for motorola specific softkeys behaviour
Canvas.setFullScreenMode() is no longer forced to true
Added Class Watcher export to txt
Fix Player.setMediaTime returning wrong values
Implemented RateControl, StopTimeControl in VLCPlayerImpl
Fixed log frame lag
Synchronized M3G objects
Fixed FPS limit in M3G games
Fixed arrays in MemoryView

Download: https://nnp.nnchan.ru/kem
GitHub repo: https://github.com/shinovon/KEmulator

Translate update v2.0.2

Fixed issues with different color schemes on Symbian 9.3
Added font size zooming by pressing Ctrl+*, Ctrl+# (9.3 only)
Fixed class error on S40

Download: http://nnp.nnchan.ru/bingt

KEmulator nnmod v2.16 update

Features:
M3G LWJGL engine from 0.9.8
- Improved performance
- Fixed SkinnedMesh rendering, Sprite3D alpha blending, nodes rendering order
- Optimized textures loading
M3G View from 0.9.8
- Better controls
- Fixed Sprite3D rendering, lighting
- Ability to show hidden nodes
M3G Settings
- Custom anti-aliasing, texture filtering, mipmapping settings
Freely resizable window
Support of Linux, Mac OS, Windows 64-bit (nnx64 build)
Java 9+ support (experimental)

Implemented APIs:
- SoftBank MEXA (from JL-Mod)
- Siemens API
Stub APIs:
- JSR 211 Content Handler
- Nokia InApp
- com.immersion.VibeTonz
- com.sprintpcs.util.System

Changes:
Improved controller support
No more kemulator.cfg
Rewrote keyboard input handling
Repaint bug from v2.15.1 fix
MIDI playback bug fix
Fixed non-fullscreen canvas rendering (v2.15.2 bug)
Fixed Nokia OTT tones
Fixed MemoryView crashes
Memory leaks fixes

Download: https://nnp.nnchan.ru/kem
GitHub: https://github.com/shinovon/KEmulator

KEmulator nnmod v2.16.2 update

Reworked "sync key events" setting
Added some more nokia device presets
Fixed camera capture
Fix NPE in Graphics.drawString (v2.16.1 bug)
Synchronized lcdui.ChoiceGroup
Implemented LG Media API
Implemented Motorola 3D API
Fixed Vodafone API SpriteCanvas rendering
Fixed restart on Mac OS 11
MascotCapsule GL engine fixes

v2.16.1:
Added MascotCapsule GL implementation from JL-Mod (WIP)
Added M3D(O) implementation from FreeJ2ME
Fixed nokiaui transparency
Implemented PantechAudio API
Fix sensor simulator in x64 build
Midi player fixes

Download: https://nnp.nnchan.ru/kem
GitHub: https://github.com/shinovon/KEmulator

NJTAI returns after 2 years of not working!

Update v1.3.0:
Fixed freezes, Updated proxy, Code refactor

Download: https://nnp.nnchan.ru/nj
GitHub: https://github.com/Feodor0090/njtai

MangaDex reader client for J2ME has been released (Still in beta!)

Features:
Lists of recently uploaded manga; Search by noscript, year and status; Downloading chapter to phone memory; Viewing chapter in app (requires huge amounts of RAM); Filters by content rating and language

Download: https://nnp.nnchan.ru/md

TLS 1.2 ON SYMBIAN IS NOW REAL.

TLS 1.2 extension for J2ME applications only (Beta!)

Supported platforms: S60v3.2 (9.3), S60v5 (9.4), ^3, Anna, Belle

Release notes:
Certificate checking is disabled
Only TLS 1.2 is supported, SSL 3 and TLS 1.0 are dropped
Development of TLS support system-wide still in progress

Download: https://nnp.nnchan.ru/tls
Share feedback: t.me/nnmidletschat

Symbian SSL patch is there.

Release notes:
Doesn't support session cache, server name checking and certificate chains, server certificate info is returned incorrectly, TLS 1.2 only
Symbian 9.1 is theoretically supported, but not tested
May not work on later 9.4 devices
MBedTLS library update to v1.1 is required

Download: https://nnp.nnchan.ru/tls
Share feedback: t.me/nnmidletschat

KEmulator nnmod v2.17 update

Features:
ALW1, vServ ads bypassing
RMS records tree in unloaded state
Security settings
APIs disabling options
3D profiler
Custom system properties (like in J2ME loader)
MascotCapsule settings tab
List & TextBox with native Look and Feel
UI Language chooser
com.bmc.media support

Changes:
M3G rendering optimizations
More Sprint API stubs
Implemented nokia.Sound(freq, duration)
Improved BlackBerry API support
Added more API compatibility settings
Audio export, ott tones options are now disabled by default
Added Portuguese, Spanish, Chinese, Ukrainian localizations

Fixes:
Nokia DirectGraphics fixes
Fix Form flickering
GameCanvas buffer fixes
Fix server socket connection
Fix compatibility with older OpenGL versions
Fix RecordStore.getSizeAvailable
Fix FileSystemListener
Fix mp3 player streaming
Player leaks fixes
Controller input fixes
Fixed built-in nokia font
Fix png decoding

Download: https://nnp.nnchan.ru/kem
GitHub: https://github.com/shinovon/KEmulator

KEmulator nnmod v2.17.1 - LCDUI Update

LCDUI:
Full Form layout support as specified in MIDP 2.0
New Canvas.serviceRepaints() implementation
Serialized commandAction() & itemStateChanged() events
Improved sizeChanged() event
Canvas.setFullScreenMode() fixes
Added "Canvas.hasPointerEvents() return value" setting
Improved Canvas regional repaints support
Implemented Gauge interactive mode
Fixed focus loss in List & TextBox
Returned softkeys handling in List & TextBox
Images support in ChoiceGroup
Implemented underlined Font style
Fixed Alert timeout (~v2.13 bug)

Other changes:
Added Float, Double to "Disable APIs" list
Changed Player.realize() behavior
More Siemens API stubs
UEI: UTF-8 console output

Fixes:
Fixed crash on RMS tab reload in settings

Download: https://nnp.nnchan.ru/kem
GitHub: https://github.com/shinovon/KEmulator

TLS 1.3 support for Symbian is now available.

After updating MBedTLS Library to version 1.2, System (SSL.DLL) and Java patches also need to be updated to their latest versions.
If you encounter problems after installing the new version of MBedTLS library, you should stay on v1.1.2, this will keep TLS 1.2 only.

Download: https://nnp.nnchan.ru/tls

PuTTY for S60v3 Patch

Added support of modern cryptography (elliptic-curves, SHA-512, etc) by updating to newer version of PuTTY engine.
Builds for S60v5 and S80v2 will be made later, source code changes are available on GitHub.

Download: https://nnp.nnchan.ru/putty
Sources: https://github.com/shinovon/s2putty

KEmulator nnmod v2.17.2

Features:
TextEditor, CanvasItem from Nokia UI 1.4
LCDUI DateField
FunLight.setRegion(I)
MetaDataControl in VLCPlayerImpl
WAV Player cache

Changes:
Enabled Nokia OTT by default

Fixes:
Snake 3 specific fix in MMAPI
Freezing at start in some LCDUI applications
GameCanvas.flushGraphics(IIII)
commandAction in List, ChoiceGroup
FPS counter not updating on idle
NPE when clicking on Form
Performance issues with event queue
Java 9+ specific fixes

Download: https://nnproject.cc/kem
GitHub: https://github.com/shinovon/KEmulator

JTube patch v2.90.0

Changes:
Automatic instance changing
Compatibility fixes for BlackBerry, Samsung, Nokia Asha
Mapped Q, P to softkeys for BlackBerry
Removed video quality choice
Virtual keyboard improvements
Slightly changed settings logic

Download: https://nnproject.cc/jtube
Donate: https://ko-fi.com/shinovon

KEmulator nnmod v2.17.3

Features:
Implemented Siemens S60 Game API
Custom system properties mapping
Ctrl+V handling in TextField

Changes:
Improved com.immersion.VibeTonz support
Adding app noscript to the noscript of window

Fixes:
Glitches when resizing non-fullscreen Canvas
HttpConnection headers starting from index 1
ImageItem layout
HttpConnection.openOutputStream() wrong state (17.2 bug)

Download: https://nnproject.cc/kem
GitHub: https://github.com/shinovon/KEmulator
Donate: https://ko-fi.com/shinovon