​LibreOffice is a complete open source alternative to Microsoft Office.  It includes, Writer (word processing), Calc (spreadsheets), Impress (presentations), Base (databases), Math (formula editing), and Draw.  Draw is an alternative to Microsoft Publisher for creating multi-page layouts.  Open, edit, and create many different file formats including .PUB, .PDF, .DOC, .DOCX, and many more!

Scribus is an open-source alternative to InDesign.  With a user-friendly interface, Scribus includes a variety of professional publishing features, such as CMYK color support, spot colors, ICC color management, and PDF creation.  Scribus also includes powerful vector drawing tools and support for importing and exporting many different file types.

Pinta is a lightweight photoshop-style drawing and editing program.  Not quite as complex and feature packed as Krita or Photoshop, yet still includes a wide variety of familiar features including, layers, adjustments, effects, clone-stamping, gradients, text and more. Users of Photoshop will feel at home with a similar tool layout and workspace.

Blender is an open source 3D creation suite. It supports the entirety of the 3D pipeline—modeling, rigging, animation, simulation, rendering, compositing and motion tracking, even video editing and game creation.

Features include:

• Photorealistic Rendering
• GPU & CPU rendering
• Realtime viewport preview
• HDR lighting support
• Permissive License for linking with external software
• Fast Modeling
• Keyboard shortcuts for a fast workflow
• N-Gon support
• Edge slide, collapse and dissolve
• Grid and Bridge fill
• Python scripting for custom tools and add-ons
• Realistic Materials & Textures
• Complete Node Support for full customization
• Physically accurate shaders like glass, translucency and SSS
• Open Shading Language (OSL) support for coding unique shaders
• Rigging
• Animation
• Compositing
• Simulation
• Game Creation

Finally a Photoshop alternative that is better than GIMP!  Krita is an Open Source FREE software with many advanced features.  Features of Krita that make it one of the best alternatives to photoshop include:

Layer Styles (Drop Shadow, Bevel, Glow etc.) YES!
Touch-friendly input for painting on tablets and touch enabled screens
Brushes (Import and create)
Import AND Save Adobe Photoshop files! (.PSD)
Vector layers, Text Layers, Vector Selection
Free scaling/transform selection & layers
Group Layers
Layer Masks
Save TIFF, PNG, JPG, and more popular graphics file-formats
CMYK Support
Adjustments (Color Balance, HSV, Levels)
Filters and Effects

Krita has many more features, and it's user interface is close enough that Photoshop users should feel fairly comfortable getting around and figuring out the differences here and there.  This is an amazing find for those looking for a powerful alternative for Photoshop.  Though it was originally designed for digital painting, it has become quite a robust piece of graphics software, and best of all, it's FREE!

Versions for Windows (32bit/64bit), Mac OSX, and Linux are available for download on the website.


https://krita.org/download/krita-desktop/

Paint.net is a photo and graphics editing tool that has much of the same main functionality, tools, and effects that Adobe Photoshop has.  The program is fast, and quite stable.  With plugins available and support for brushes, layers, and more, this FREE software is a great alternative to Photoshop for those wanting Photoshop-style editing ability without the price-tag.
More from the GetPaint.net website:
Paint.NET is free image and photo editing software for PCs that run Windows. It features an intuitive and innovative user interface with support for layers, unlimited undo, special effects, and a wide variety of useful and powerful tools. An active and growing online community provides friendly help, tutorials, and plugins. It started development as an undergraduate college senior design project mentored by Microsoft, and is currently being maintained by some of the alumni that originally worked on it. Originally intended as a free replacement for the Microsoft Paint software that comes with Windows, it has grown into a powerful yet simple image and photo editor tool. It has been compared to other digital photo editing software packages such as Adobe® Photoshop®, Corel® Paint Shop Pro®, Microsoft Photo Editor, and The GIMP.

This program's title is deceptive.  It is SO much more that a batch photo resizer!  It capabilities include a wide array of image adjustments including, color/hue, brightness, contrast, dpi, size, and more!  Add multiple borders with different colors, shadows, watermarks, and best of all, you can process all of these effects on a huge batch of photos all at once!

If you find yourself editing images one at a time, or want some of the benefits of a commercial image processing program like Adobe Lightroom, you might give this freebie a try!

With this handy tool, Windows users can easily re-size one or more photos right from the folder they are in through the right-click menu!  Just select one or more images and right-click. Select "Resize Pictures" off the menu and select one of the preset sizes, or create a custom size.  Works great to quickly re-size images for email or web applications.  If you work with images often, or find yourself spending hours loading your graphics or photo programs to re-size photos individually, this program will be a huge time-saver!

Inkscape is a free, open-source vertor art editing program with functions similar to Adobe Illustrator.  With tools that allow for editing and creation of many popular vector art formats including .pdf, .eps, .svg, and more, graphic designers are sure to appreciate this free software alternative.  An added benefit is the tracing function which allows a static photo to be converted into a vectored file.