How to produce assemble effect in software product videos
These sequences are produced using Animation™. Animation™ is the technique of manipulating objects or images to create the appearance of motion. If you look closely at the sequences, maybe slowing them down so you can step through them frame by frame you'll be able to see what's going on, and then you just have to work out how to do it with whatever tools you use.

I'd say screen shots of the UI elements have been chopped up with an image editor (e.g. , CinePaint, Darktable, DigiKam, F-Spot, G'MIC, GIMP, GimPhoto, GIMPshop, GNU Paint, GrafX2, GraphicsMagick, gThumb, Hugin, ImageJ, ImageMagick, Inkscape, KolourPaint, Krita, LazPaint, LightZone, MyPaint, Panorama Tools, Pencil2D, Phatch, Pinta, Rawstudio, RawTherapee, Seashore, Shotwell, Tile Studio, Tux Paint, UFRaw, XPaint, Brush Strokes Image Editor, Chasys Draw IES, FastStone Image Viewer, Fatpaint, Fire Alpaca, Fotografix, IrfanView, MediBang Paint Pro, Moai[1], Paint.NET, PhotoScape, PixBuilder Photo Editor, Pixia, Project Dogwaffle 1.2 Free Version, XnView, Ability Photopaint, ACD Canvas X (formerly Deneba Canvas), ACDSee, Acorn Image Editor, Adobe Photoshop, Adobe Photoshop Lightroom, Adobe Photoshop Elements, Affinity Photo, ArcSoft PhotoImpression, Artipic, ArtRage, Autodesk SketchBook Pro, Bloom Image Editor, Capture One, CodedColor PhotoStudio Pro, Corel Painter, Corel Painter Essentials, Corel PaintShop Pro, Corel Photo-Paint, Erdas Imagine, GraphicConverter, Helicon Filter, Iridient Developer, LView Pro, Manga Studio, Microsoft Paint, NeoPaint, OpenCanvas, Paint Tool SAI, Photogenics, PhotoLine, Photo Mechanic, Photos (Apple app), Photo Raster, PicMaster, Pixelmator, Pixen, PMview, Portrait Professional, Project Dogwaffle, QFX, Serif PhotoPlus, TVPaint, Xara Photo &amp; Graphic Designer, Zoner Photo Studio, Mara, Pixlr, PicMonkey, PicsArt).

Then the separate elements were then moved around in an animation / compositing app, e.g. Blender, Cinelerra, Kdenlive, Natron, OpenShot, Shotcut, Adobe After Effects, Apple Motion, Autodesk 3ds Max, Autodesk Inferno, Flame and Flint, Autodesk Maya, Autodesk Smoke, CompTime, FXhome HitFilm, Saber, Houdini, Blackmagic Fusion, Mistika, Nuke, Piranha, SilhouetteFX, Autodesk Combustion, Autodesk Softimage, Autodesk Toxik, Aviary, Peacock, Avid DS, Avid Elastic Reality, Avid Matador, Avid Media Illusion, Kodak Cineon, FXhome Lab, Range, Pinnacle Commotion, Silicon Grail's RAYZ and Chalice or Shake.