Website of the Sigil-Ebook GitHub Organization describing Sigil as an EPUB editor and PageEdit as a companion XHTML editor.
OrionsArm
Orion's Arm is a collaborative science fiction universe with an encyclopedia and worldbuilding materials.
About OrionsArm
Orion's Arm is a collaborative, ever-expanding science fiction universe project that provides free access to an extensive encyclopedia, original creative writing, and worldbuilding resources. The setting is positioned thousands of years in the future, with civilization spanning the stars, ruled in part by godlike ascended intelligences, and featuring hard science, plausible technologies, realistic cultural development, and over 10,000 years of in-universe historical context. Users can explore content covering in-universe culture, society, science, technology, alien sophonts, and galactography, or participate in the project's community spaces to contribute to the shared worldbuilding effort. The project also sells official merchandise and published books and eBooks set in the Orion's Arm universe.
Key features
- Encyclopaedia Galactica covering culture, science, technology, and sophonts
- Original creative writing including stories, character profiles, and Traveler's Notes
- Community spaces including forums, Discord, Facebook, and Tumblr groups
- Illustrated primer and introductory guides for new users
- Member galleries for user-submitted music, videos, and art
- Official merchandise and published Orion's Arm books and eBooks for sale
Best for: Science fiction fans, worldbuilding hobbyists, and writers interested in collaborative hard sci-fi settings benefit most.
Good for
- Ever-expanding collaborative worldbuilding effort with thousands of years of in-universe history
- Focus on hard science, plausible technologies, and realistic cultural and exobiological development
- Free access to extensive encyclopedia, creative writing, and community resources
OrionsArm at a glance
- Website
- orionsarm.com
- Category
- Books & Reading › Reading Resources
- Type
- Website
- Pricing
- Not confirmed. Check the site
- Platforms
- Web
- Open source
- Not stated
- Last checked
- Oct 6, 2026 · Online when checked
- Listed
- Oct 5, 2026
OrionsArm alternatives
Tools and sites you could use instead, ranked by how closely they match.
This online converter turns text and document files into common ebook formats, with more than 15 input types.
The Hermetics library links to texts on ancient mythology, occult subjects, magic, alchemy, astrology, and related topics.
Booksie lets writers publish and share novels, short stories, poems, and other writing online.
ReciproCard helps Libby users discover reciprocal library memberships.
SikhBookClub shares books about Sikhism, including works by Bhai Vir Singh.
Popular in Reading Resources
Well-known listings from the same topic.
Internet Archivearchive.org/details/moviesandfilmsVestal Reviewvestalreview.netWattpadwattpad.comScribdscribd.comPoop Fictionreadpoopfiction.comLibris Adeptilibrisadepti.com
OrionsArm FAQ
What is the Orion's Arm Universe Project?
It is a collaborative science fiction universe set thousands of years in the future, with an encyclopedia and worldbuilding materials, featuring interstellar empires ruled by godlike ascended intelligences and diverse factions.
How can I get started exploring Orion's Arm?
New users can start with the illustrated primer, canon, and FAQ, or ask questions on the project's forums or Discord.
What types of content are available on the site?
The site offers an encyclopaedia, original creative writing, member galleries, community forums, and official merchandise for purchase.
Is something wrong or out of date?
Tell us and an editor will check it.
Own this website?
Claim this listing
Claim the listing and suggest updates yourself. An editor checks every claim first.