Internal text editor (F4)  with syntax hightlighting
    Built in file viewer (F3) to view files of in hex, binary or text format
    Archives are handled like subdirectories. You can easily copy files to and from archives. Supported archive types: ZIP, TAR, GZ, BZ2, XZ, LZMA, 7Z and also RPM, CPIO, DEB, RAR, ZIPX
    Extended  search function with full text search in any files
    Configurable button bar to start external programs or internal menu commands
    Total Commander WCX, WDX, WFX and WLX plug-ins support


    Unicode support
    Most operations working in background
    FTP, FTPS, FTPES, SSH+SCP and SFTP protocols support
    Multi-rename tool
    Tabbed interface
    Custom columns
    File operations logging
github
    

Small and fast
Dark mode
syntax highlighting
code folding
limited autocompletion
Autosave
Finding and replacing strings of text with regular expressions
Searching text strings within opened tabs
Searching text strings in a directory
Guided indentation
Line bookmarking
Macros
Simultaneous editing
Split screen editing and synchronized scrolling
Line operations, including sorting, case conversion (Uppercase, lowercase, camel case, sentence case), and removal of redundant whitespace
Tabbed document interface
website
    

Small and fast
Multi-format 
(PDF, EPUB, MOBI, CBZ, CBR, FB2, CHM, XPS, DjVu)
website
github
    

Quickly create screenshots of a selected region, window or fullscreen
Easily annotate, highlight or obfuscate parts of the screenshot
Export: save to file, send to printer, copy to clipboard, attach to e-mail, send Office programs or upload to photo sites like Flickr or Picasa, and others. 
github
website
    

Small and fast
Multi-format 
Popular: JPEG, GIF
Lossless: BMP, PNG, TIFF
Web: WEBP, JXL, HEIF/HEIC, AVIF
Legacy: TGA, WDP, HDP, JXR
Camera RAW formats:
    Adobe (DNG), Canon (CRW, CR2), Nikon (NEF, NRW), Sony (ARW, SR2)
    Olympus (ORF), Panasonic (RW2), Fujifilm (RAF)
    Sigma (X3F), Pentax (PEF), Minolta (MRW), Kodak (KDC, DCR)
Basic Image Editor
github
old website