A fork of Carl Sassenrath’s original source release of REBOL 3 alpha, by longtime REBOL community member Oldes.
GitHub - Oldes/Rebol3: Source code for the Rebol [R3] interpreter
CHANGES.md shows the update history, making a long list of differences since forking from the original Rebol3 alpha release.
Rebol3 installation
Determine the latest release from Releases · Oldes/Rebol3
Download, push it onto your path, make it executable, mark it safe for macOS:
Code Sample
wget https://github.com/Oldes/Rebol3/releases/download/3.20.0/rebol3-bulk-macos-arm64.gz
gunzip rebol3-bulk-macos-arm64.gz
mv rebol3-bulk-macos-arm64 ~/.local/bin/rebol3
chmod 755 ~/.local/bin/rebol3
xattr -d -r com.apple.quarantine ~/.local/bin/rebol3
Obvs you can skip that last step when not on macOS.
Rebol3 usage
Launch the REPL with rebol3. Documentation is mainly the help system.
See what modules are available:
Code Sample
help system/modules
Precompiled builds of Rebol3
Gathered from Rebol3/make/rebol3.nest at master · Oldes/Rebol3 · GitHub on 2025-10-25.
Base
minimal additions (not much useful)
Core
includes a little bit more stuff than the Base
Code Sample
include-rebol-core: [
; :include-mezz-ansi
:include-clipboard
:include-cryptography
:include-bincode
:include-iconv
:include-xxhash
:include-mail
:include-prot-https
:include-codec-unixtime
:include-codec-ar
:include-codec-gzip
:include-codec-zip
:include-codec-tar
:include-codec-json
:include-mezz-date
;:include-codec-rebin ;not yet ready!
config: INCLUDE_SHA224
config: INCLUDE_SHA384
product: Core
]
Bulk
includes almost everything
Code Sample
include-rebol-bulk: [
:include-rebol-core
:include-optional-checksums
:include-image-natives
:include-lzma-compression
:include-lzw-compression
:include-brotli-compression
:include-crush-compression
:include-base36-encoding
:include-base85-encoding
:include-view
:include-audio
:include-midi
:include-serial
; Extended crypto features
:include-cryptography-bulk
:include-codec-pdf
:include-codec-swf
:include-codec-gzip
:include-codec-zip
:include-codec-tar
:include-codec-bbcode
:include-codec-html-entities
:include-codec-csv
:include-codec-xml
:include-codec-wav
:include-codec-ico
:include-codec-plist
:include-image-codecs ; use other optional image codecs before this include!
:include-mezz-colors
:include-prebol
:include-prot-whois
:include-prot-mysql
:include-prot-daytime
:include-dialecting ;`delect`
:include-native-oid ;`form-oid`
config: INCLUDE_PNG_FILTER ; includes `filter` and `unfilter` natives
;- for tests:
:include-test-extension
;- not recommanded:
;:include-native-wav-codec
product: Bulk
]