Software
Also consider spending time to browse this list of Open Source, Experimental, and tiny tools, collected by Everest Pipkin.
When it comes to virtual teaching/remote work, resources are collected here and here.
A non-exhaustive list of tools for creating VR/AR content. In no particular order. Any editorialization to be taken with a grain of salt.
Backups / File Management
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    Backblaze - Cloud backups 
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    Syncthing - Open source folder syncing/backup 
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    WinDirStat - Disk usage viewer, helpful for cleanup. Alternatives for mac 
Game Engines
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    Unity - Free to use, C# 
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    Unreal Engine - Free to use, Blueprints/C++ 
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    Godot - Free, Open Source, GDScript, C#, C++ 
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    PlayCanvas - HTML5/WebVR 
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    LÖVR - Open source, lua WebVR Frameworks
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    3D Modeling (Desktop)
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    Blender - Free, Open Source 
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    Maya - Paid 
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    3DSMax - Paid 
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    Cinema4D - Paid 
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    Sketchup - Paid 
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    MeshMixer - Free 
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    MagicaVoxel - Free, voxel-based, very easy to use. 
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    Spritestack.io - Free, Premium Tier 
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    AssetForge - Paid 
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    MakeHuman - Free 
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    ProBuilder (in Unity) - Free 
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    Rhino3D - Paid 
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    Figuro - Free, in browser 3D Modeling (In VR)
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    Google Blocks - Free 
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    Oculus Medium - Free 
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    Microsoft Maquette - Free 
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    Gravity Sketch - Paid 
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    Mesh Maker VR - Free 
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    Kodon - Paid 
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    Masterpiece VR - Paid 
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    VoxVR - Free 3D Modeling (Sculpting Workflow)
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    zBrush - Paid 
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    PolyBrush (in Unity) - Free 
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    Desktop Software: Blender, Cinema4D, and Maya have built in sculpting workflow tools. 
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    VR Software: Medium, Kodon, and Masterpiece VR primarily use sculpting workflows. Painting/Animation in VR
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    Quill - Free, Oculus 
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    Tilt Brush - Paid, Cross Platform Digital Painting programs
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    JSPaint - MSPaint in the browser 
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    Vector Art
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    3D Modeling Utility/Processing/Converting
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    MeshLab - Free. 
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    fSpy - Free. Calibrate camera to reference images. 
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    fSpy Blender Add-On - Open Source 
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    Meshmixer - Free Image Editing
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    Adobe Photoshop - Paid, Recurring subscription 
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    Affinity Photo - Paid, One Time 
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    GIMP - Free, Open source 
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    Glimpse - Fork of GIMP with better UI 
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    Paint.NET - Free, Windows Only 
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    Pixelmator - Paid, Mac/iPad Only 
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    Snapseed - Free, Mobile/Android Image Viewer
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    Irfanview - Free, fast. Can zoom in and proof easier than built into windows. 
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    DJV - Free, Open Source. Lets you preview an image sequence as a movie. Texture Map Creation (Procedural)
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    Substance Designer - Paid. Industry standard. 
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    Material Maker - Free, Open Source 
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    Quixel Mixer - Free: Quixel was recently bought by Epic, use Epic Games account to log in. Texture Map Creation (From Images/Utilities)
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    Materialize - Free 
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    ShaderMap - Paid/Free versions 
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    CrazyBump - Paid 
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    AwesomeBump - Free, Open Source 
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    xNormal - Free (highPoly -> lowPoly Models) 
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    Laigter (normals for 2D sprites) - Free (pay what you want) 
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    Normal Map Online - Free, online, open source 
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    3D Model Auto-Rigging
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    Mixamo - Free (Adobe account required) 
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    Auto-Rig Pro (Blender) - Paid Photogrammetry
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    Agisoft Metashape - Paid 
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    Autodesk Reality Capture - Paid 
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    PhotoModeler - Paid 
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    MeshRoom - Free, Open Source Video Editing- 
        Adobe Premiere Pro - Paid, subscription. 
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        DaVinci Resolve - Free, fully featured. Color grading is particularly top-tier. There’s no catch: Blackmagic Design makes money from hardware sales. 
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        Shotcut - Free, Open Source. 
 Video Utility
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    MpegStreamclip - Video converter, Free 
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    LiceCap - Gif From Screen Section, Free AR Creation and Editing
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    Audio Editing (non-music focused)
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    Audacity - Free, Open Source 
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    Pro Tools - Paid, Free version 
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    Adobe Audition - Paid 
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    Wave Shop - Free, Open Source Multimedia Programming/Processing
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    Cycling74 Max - Paid Sound Effect Creation
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    BFXR - Free 
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    SFXR - Free 
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    rFXGen - Free, based on sfxr 
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    LabChirp - Free 
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    Explodomatica - Free 
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    rFXGen - Free 
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    ChipTone - Free Music Composition
Screen Capture
Note Taking
I recommend plaintext for digital notes. More generally, any open format that isn’t tied to a particular piece of software of workflow. Notes should last forever. Which is longer than software usually lasts.
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    Obsidian - Notes in plaintext and markdown formatting. Notable support of backlinks and a graph view of linked notes, custom themes, voice memos, daily notes/templates, and keyboard only support. Sync thrugh git plugin or paid upgrade (not released yet at time of writing). 
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    Simplenote - Simple plaintext/markdwown notes with universal platform support and very competent syncing and backups. Great simple upgrade to a phones notes app. 
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    Standard Notes - Free, Open source, encrypted plaintext notes with syncing. 
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    Workflowy - Infinite Hierarchy/nested document structure. Extremely flexible with capable power features. Great for notes, todos, organization, mood boards, and more. 
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    Dynalist - Workflowly competitor. Better-but-still-not-great support for inline images. Pro version has automatic daily backup. 
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    Joplin - Free, Open Source, cloud sync through dropbox or oneDrive. Well supported API and means wide compatibility for import/export and app optind. 
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    Milanote - Free teir, then $10/mo. Very visual. Highly featured board/tasks/project organization. Teams support. Cloud based for easy syncing to mobile app/web. 
Study Aids (Flash cards)
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    Quizlet - Mobile apps/sync, public cards, various learning strategies. 
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    Mochi - Markdown syntax, Syncing, mobile/web. Clean design. 
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    Anchi - A longstanding robust solution with a variety of features. 
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    RemNote - Supports hierarchial and linked structures for taking notes in, and can generate the flash cards from this knowledge base. Text Editors
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    Textreme - Distracted plaintext writing 
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    Left - Minimalist plaintext writing 
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    Markdeep - Markdown writing full of extra features 
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    Mark Text - Simple, fast, markdown editor Code Editing IDE’s with Plugin/Package Support
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    Jetbrains Rider - Paid, Free for Students, exceptional Unity features/support 
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    VS Code - Free, cross platform 
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    Atom - Free, cross platform 
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    Sublime Text - “Free”, Paid with unlimted free trial 
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    Notepad++ - Free. Notably lightweight on system resources 
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    Geany - Free, lightweight 
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    Microsoft Visual Studio - Free. Not VS Code… more like it’s “big brother”. Often installed, it helps manage C/C++/C# compiling/support libraries/build chains. 
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    CLion - Basically Rider but for C and C++ (i.e.: Unreal). Paid, Free for students. Color Themes for IDE’s
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    Rainglow (My personal favorite, earthsung, is in this collection). 
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    Dracula (Also check out fan-favoriate, Darcula. a darker version of this theme) 
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    Grubbox. Original is for VIM, Been ported to Jetbrains Rider/CLion, VSCode, Sublime, etc. Just search for it Git Graphical Interfaces
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    Fork - Free 
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    Kraken - Free, pro version available 
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    GitHub Desktop - Free 
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    SourceTree - Free 
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    GitFiend - Free 
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    Sublime Merge - Paid with unlimited free trial VR Third-Party Software/Support TOols
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    SideQuest - Install games onto the quest from .apk files, plus an unofficial storefront 
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    Itch.io - Indie Game Storefront, has some VR titles