Alternatives to PTLens for all platforms with any license

GIMP

GIMP is a free program for such photo retouching, image composition and image authoring. Essentially it's the closest thing to Photoshop you can get for free.

Free Open Source Mac OS X Windows Linux BSD PortableApps.com ... Haiku AmigaOS Xfce
Layer manipulation Support for Layers Batch image manipulation Color to Alpha ... Customizable Extensible by Plugins/Extensions Keyframe animation Photo effects Retouch photos Portable Open PSD files Scripting support Symmetry brush Add a feature

3300 Like
showFoto

ShowFoto is the standalone image editor of the digiKam project. It runs without digiKam images database support, but provides all Image Editor functions.

Free Open Source Mac OS X Windows Linux KDE
No features added Add a feature

11 Like
Ultimate Paint

Ultimate Paint is a full-featured 32-bit Windows graphics program for image creation, viewing and manipulation. UP supports JPEG, GIF, PNG, BMP, PCX, AVI (reading...

Freemium Windows
Photo effects Add a feature

6 Like
- Discontinued The program is no longer updated. Last version, 2.88, released on 6 october 2005, can be still downloaded from the official website.
ShiftN

ShiftN is an intelligent tool capable of analyzing photos and fixing the line distortion (line convergence) effect automatically or with minimal user’s input. Batch...

Free Windows
No features added Add a feature

5 Like
WidsMob Retoucher

WidsMob Retoucher is an excellent photo retouching program, which is able to reduce image noise, portrait retoucher, film pack, adjust effects, fish eye effects...

Commercial $ $ $ Mac
Retouch photos Add a feature

2 Like
GimpLensfun

GimpLensfun is a Gimp plugin to correct lens distortion using the lensfun library and database.

Free Open Source Mac Windows Linux GIMP
No features added Add a feature

1 Like
Home Photo Studio

Home Photo Studio is powerful and easy-to-use photo editing software offering a complete set of image manipulation tools. Thanks to a convenient interface and a detailed...

Freemium Windows
Photo effects Add a feature

2 Like
Photopainter

Photopainter is both a natural-media painting software and an image processing system at the same time. You can not only use it to retouch your photo, but also...

Commercial Windows
No features added Add a feature

2 Like
- Discontinued The program is no longer updated. Last version, 1.5.2.5, released in December 2007, can be still downloaded from the official website.
Saint Paint Studio

Saint Paint is the ideal paint package for creating and editing True Colour, 256 colour, 16 colour, and Monochrome graphics, and animating in any mode or combination of...

Commercial Windows
No features added Add a feature

2 Like
- Discontinued No updates since 2008.
RealWorld Photos

RealWorld Photos is an free portable photo editor for Windows. Retouch photographs and batch process images in an easy-to-use editor. Perform lossless retouching...

Commercial Windows
Retouch photos Portable Add a feature

1 Like
NeoPaint

NeoPaint is a full featured artist's studio for Windows that's easy-to-learn, powerful and affordable! It's simple enough for beginners yet packed with...

Commercial Windows
Retouch photos Add a feature

1 Like
Wizardbrush

Wizardbrush is a natural media painting software which has a lot of brushes and paper with realism style. You can create realistic picture with it. You can not only use...

Commercial Windows
No features added Add a feature

1 Like
- Discontinued Last version, 6.7.7.6, was released on November 2011.