YES! Finally a Motörhead song posted!

Wrote about this before but if it got missed go and check it out as it is the only drum machine that synthesize the sounds real time and have X-Y pads for each parameter for 
each drum. Each drum coming with their specific set of controllers.
It is definitely something that is made for live tweaking or direct recording. 
Now it comes with the possibility to save presets which can be a good thing if you have tweaked the drums to perfection or for different starting points.
In my opinion it is one of the better apps for music making on Android specially for live tweaking and it is for free and without publicity.

Play Store link:
DMach

Surprisingly good "multi-track" sequencer with 40 sample based instruments.
If you are a parent and want to ease your child into some more advanced music software this could be the ticket. It is possible to do some basic music sketching as well.
The only negative is that even though you can play more than one instrument at the same time it does only trigger one instrument at a time if they play the same note slot.
A child would probably not care too much and if someone want to use it for some sketching it is possible to do so using just one instrument.
For free and no publicity.

Play Store description:
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Create your own music with Sketch-a-Song! Our colorful, intuitive interface makes it fun and easy for anyone to make music in seconds.

Sketch-a-Song is proudly ad free, and there are no in-app purchases. Just make music and have fun!“Sketch-a-Song brings composition to life for students of all ages. This app is so fun, visually appealing, and easy to use. My students don’t even realize they’re learning!” – Julie Wild, Music Teacher.

- “Like an orchestra in your iPad” – Raymond, age 9
- “No matter what you do, it almost always sounds pretty good” – Nate, age 11

Try it now and see why kids and people of all ages LOVE composing in color with Sketch-a-Song. Express your creativity, learn the fundamentals of music composition and increase your music appreciation while having a blast!

Here’s how it works:

SKETCH YOUR SONG
- Create music more easily than ever! Simply tap and drag to create, move, and edit notes. 
- Build your own ensemble from over 40 free instruments without navigating complicated menus or settings.
- Connect visual patterns with sounds using our colorful, intuitive interface.
- Hear your song play back in real time as you build it.

INNOVATIVE SKETCHPAD SYSTEM
- Experience our patent-pending musical system, which takes advantage of time-tested music theory principles to make sure that your music sounds harmonious.
- Explore eight different sketchpads and characters, each with their own unique personality and sound.
- Add measures to link sketchpads together and create a beautiful backdrop for your masterpiece!

INSTRUMENTS
- Play all of your favorite instruments like a virtuoso.
- Enjoy using high quality samples of over 40 real instruments ranging from rock and pop to orchestral.
- Experiment with melodic instruments in five categories: Keyboards, Strings, Woodwinds, Brass, and Voices!
- Master drums and percussion instruments from around the world.

No matter who you are or what your background is, Sketch-a-Song makes music accessible and rewarding. PARENTS: empower your child and ignite a lifelong love of music through genuine creativity. TEACHERS: supplement your lessons with an accessible and immediate way to demonstrate instrumentation, rhythm, melody, harmony, and more. KIDS: impress your friends with your awesome songs and have a great time experimenting with musical melodies. Anyone can have fun composing music with Sketch-a-Song.

NOTE: Sketch-a-Song is (and always will be) AD FREE. We do not require an account and collect no private data. 
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There is also the Caustic file that you can download if you do not see or understand what is going on in the video:
http://www.singlecellsoftware.com/node/6449#new
There is a big possibility that this link will be obsolete soon so if it does not work go to the forum and search; "Builderz Vocals DSP Model for Caustic" and it should be easy to find.
http://www.singlecellsoftware.com/forum

To check out the game that the composer was also a developer in, go here:
http://www.thegordianknotgame.com/

This is in my impression the one 303 that sounds the best and it also comes with two drum machines. In feature set it is very similar to Mikrosonic's RD4 and with a tablet RD4 is the more easy and fun one to use as a groovebox but as the sound is not as sharp as AUDIOID and as the interface as a groovebox is good enough on AUDIOID would / will be the one I would turn to if I needed a 303 workstation. Now it has one more synthesizer engine at it's disposal that is intertwined with a new sequencer type based on this hardware sequencer:

Here is the whole upgrade info:
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- overwriting issue when recording
- performance issues (Audio DSP fully rewritten in RenderScript)
- linear/logarithm levels
- heavy UI overdraw
ADDED
- new machine MPL-185 (Metropolis-like sequencer)
- 2x chained FXs per machine
- reverse, ping-pong and brownian loop mode
- cloud save/load/delete (assuming a Google account is available)
- circular buffering
- Compressor FX
- a second oscillator per synth
- an LFO per synth (with tempo sync and gate sync)
- values display
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So as is obvious there is a lot of exciting stuff that was not there before and was playing some with the new functions yesterday will continue tonight.
It is highly recommended and as the price is so low ( 1.99$ / 1.50€ ) do not see any reason not to get it and give it a go but there is a free version to try and lastly want to point out that there is separate smaller apps that can be bought with just the rhythm machine and one with just the 303 but have to say that you do not save much money and they are not updated.

Play Store link
AUDIOID

Mikrowave got updated but also wanted to mention the arpeggiator that got incorporated last update making Mikrowave one of the contenders for authentic Chiptune sounds.
Being a arpeggiator that can play very short arpeggios it emulates the sound from tracker software that wanted to emulate chords but the original trackers only having four tracks and playing notes monophonically the only way to emulate chords was to decide the notes in the arpeggio and then they would be played in rapid succession making a sound that is very specific for chiptune and early computer music using trackers.
Also being able to have up to eight notes in any position and deciding the playback speed 
( making it possible to use in a more traditional way ) makes this arpeggiator very flexible.
Just wanted to point this out if you have missed out on MikroWave and are interested in making Chiptune sounds. Of course Mikrowave is not only for Chiptune music but it is now in my eyes one of the better apps for making those kind of sounds if one is willing.
Sorry for going on about an older update but felt that it is worth pointing out as it can easily be missed looking into the app...
Here is the latest update:
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- improved multi touch response for keyboard
- on tablets you can now adjust synth parameters while simultaneously playing the keyboard for quick improvising or live performance!
- incremental adjustments to tempo are now visible
- miscellaneous bugfixes for stability and audio performance
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The app is cheap and a good addition to whatever synthesizers / sequencers already installed as it can be used for live tweaking, basic song making and the synthesizer engine and effects sounds good complementing other apps.
There is also a free version with saving disabled.

Play Store link:
MikroWave

Have not tried to load DX7 presets into SynPrezFM but it is supposed to be an easy task:
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SynprezFM 2 is also a Yamaha DX7 emulator, that can render with accuracy the sysex files you upload into an external storage directory setup by menu, in order to extend the experiment.
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Maybe it is a bit of an overkill to get even more ready made sounds as SynPrezFM comes with 1024 presets... but anyhow if that is not enough go here:
http://bobbyblues.recup.ch/yamaha_dx7/dx7_patches.html

Play Store link:
SynPrezFM II

Mr Nightradio's own programming language that he used to create:
Virtual ANS spectral synthesizer
PixiTracker - simple and fun sample based tracker with minimalistic pixel interface
PixiVisor - revolutionary tool for audio-visual experiments
Soul Resonance - audio-visual album
PixelWave and SpectrumGen synths
Northern Forests and Dragon's Game videos
Tangerine Birthro 2012
It has also been mentioned some time ago that Pixilang would be built into SunVox directly and we can only hope that it happens sooner or later...
Here is what is included in the update:
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• experimental camera support (for iOS, Android and Linux); API is unstable now; check the camera.pixi example for more details;
• additional parameter (optional) flags has been added to copy();
• additional parameter (optional) offset (write/read offset in bytes) has been added to fgets(), fwrite() and fread();
• additional parameter (optional) max_xsize has been added to print(), get_text_xsize() and get_text_ysize();
• new flag for the copy(): COPY_NO_AUTOROTATE (don't rotate pixels from GL_SCREEN);
• type DYNAMIC has been removed;
• flags parameter has been added to the thread_create() function; now only one flag available - THREAD_FLAG_AUTO_DESTROY;
• new container flag: GL_NO_ALPHA;
• new data processing operations for the op_cn(): OP_H_INTEGRAL and OP_V_INTEGRAL (running sum), OP_H_DERIVATIVE and OP_V_DERIVATIVE (first difference), OP_H_FLIP and OP_V_FLIP, OP_SUM;
• new function: gl_bind_framebuffer();
• new function: rotate() for rotating the container;
• new function: copy_and_resize();
• new function: get_system_log();
• new sound examples: input_to_output, input_visualizer;
• new graphics examples: camera, filtering.motion_blur2, integral_and_derivative, rotate_container, flip, copy_and_resize, save_avi_mjpeg;
• new OpenGL examples: texture, render_to_texture;
• bugs fixed.

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Palm Sounds also mentioned this update with some personal reflections that can be read here:
http://www.palmsounds.net/2014/08/pixilang-35-arrives-but-this-has-pretty.html

Play Store link:
Pixilang
For other versions:
http://www.warmplace.ru/soft/pixilang/