Ok,
I wrote a texture browser you might find useful. It browses textures tiled, tiled fliped and also has some smart tools to make texture borders seamless.

From the readme.rtf:

Hamburg Apri 2020.
Corcitextu v.0.9 - a texture browser developed in the time of the corona virus pandemic.
By . J Hunke (Neodumont). Corvitextu v.0.9 is freeware.

What is Corvitextu ? Corvitextu is a texture browser for your textures
you may have collected from the net. Texture collctions are sometimes very mixed
the pickles with some are seamless and others not and of different, sometimes very
large size.
With Corvitextu you can browse your folders quickly in
normal, tiled or flipped mode to check if the textures you got are seamless or not.
Just use the left mousebutton to browse, right mousebutton to go back to panel.
Browsing only works forward.

Then you can sort out the textures you need for your project and save them directly
as 512x512 bmp to a target folder. 512x512 pixels will be saved in this version only.

Corvitextu also provides tools to make a texture border seamless on a high quality
level ( with Auto Fuzzer or Fuzzer ).

Corvitextu is a tool dedicated to the Gamestudio (Opgroup) community and I had the Indie developer in mind who wants to create som new WAD (texture) files. (Note: In gamestudio you can load 10 textures into a wad file with one stroke by selecting 10 files. Together with Corvitextu I publish 147 high resolution jpg real world photos (each 2608x1952 pixels) I made some time ago for you to check out the crop function of Corvitextu. Set the stretch to screen checkbox and browse the jpg texture folder. Then crop out what you want, make the texture seamless and save it to your target dir.

Instructions:

Determine a target directory for your save bmps first.

Load texture: can load .bmp . jpg .gif .pcx .tga .png. files.
Browse buttons load the indicated file formats only.
Tiled and fliped checkboxes allows browsing in these modes to check seamlessness.
Filename is displayed in the window frame with size of the source (!) pic, when Corvitextu is run in windowd mode.

Stretch view to 512: Stretches every pic loaded to 512x512 pixels
Stretch view to screen: Stretches every pic loaded to screen (display) size.

Rotate: rotates a 512x512 screen 90 degrees.

Auto blend: blends the borders into each other via alpha mask from WORK dir.
Works only when 512 checkbox is set and loaded pic is 512x512 pixels properly.
Usually creates the well known mirror effects at the borders, when textures are
very structured. Really better is Autofuzzer.

Crop (cut out) from large textures: Load or browse a (large) texture best with stretch to screen set.
Click on a left upper pos, then on a right down pos. to crop to 512x512 new texture size.
Croped screens must be saved seperately and need a filename given from you.

Fuzzer: Click on a start/cutout pos, then on paste pos to patch. Flipper flips patch hor.
Alpha mask is in WORK dir named Fmask.bmp. With Fuzzer you can harmonize
a texture or remove unwanted details quickly. Dont pick a patch from a position near a border
or parts of the dark background will be taken with the patch.

Auto fuzzer: Creates seamles borders for perfect tiling for most textures
(in 512x512 size only). Use Fuzzer to optimize manually if you want.
Auto fuzzer copies alpha masked patches from random positions of the texture
(not from positions near borders) and lines them over all borders.

Copy to clip: Copies the 512x512 screen to clipboard, if 512er checkbox is set.
If stretch to fullscreen is set the whole screen will be copied to Clipboard.
Get from clip gets the clipboard pic to workscreen.

UNDO: Undoes the last -Auto fuzzer- action. Backup screen was saved to clipboard before.

Check seamless: Shows texture tiled to check if borders/edges are gone.

NOTE: Corvitextu saves to 512x512 pixel size and IN BMP FORMAT in this version ONLY !

Enhanced version is planned.

All pics you load will be saved as bmp files to your target dir. Filename will be preserved, extender will be changed to bmp.
-Overwrite existing file ?- checking and warning message exists.

Other Issues:
Note: -PCX browser- works only reliable with stretch to 512x512 set.
Dont know why at the moment. Should be the only bug.
Alpha masks for -Autoblend- are in Work directory, you may change them if you want.
Make always sure you have the prospeed.dll and nview.dll and includes in the program directory.
Corvitestu is a mobile program and does not need any installation process and does not change your windows registry.
Too large or akward files cannot not be displayd.

Please note this version is a beta version and may not be 100% bugfree, although I tested Corvitextu havily and encountered no crashes. It was also tested on 4 different machines.
Corvitextu was written in XProfan9 from RGH Software on an old WinXP machine.
It should run on Win 98 to Win 7
Many thanks go to Roland G. Huelsman, Frank Abbing, Andreas Miethe and
K. Nishita

Note: There is also a nice free texture autoseamer program from Nem(Ryan Gregg). Check it out !

Corvitextu v.0.9 is absolutey freeware and may not be sold in any way.

Neodumont

You can download Corvitextu from my webspace here:

Corvitextu texture browser download

You can download a free texture package (140 Photos in each 2608x1952 size) for training with Corvitextu from here:

Free highres texture photos download