| Biology 2e | L1–2 Foundational | CC-BY-NC-SA | mirrored | 1,475 pp. | openstax |
| Biology for AP® Courses | L1–2 Foundational | CC-BY-NC-SA | mirrored | 1,745 pp. | openstax |
| Biology of Aging Libretexts | L1–3 Foundational | CC-BY | link only | — | libretexts |
| BIO Majors 4A+4B Lab Manual Darcy Ernst, May Chen, Katie Foltz | L1–3 Foundational | CC-BY | mirrored | 454 pp. | libretexts |
| BIOS15: Lab Manual Harmony Folse | L1–3 Foundational | CC-BY-NC-SA | link only | — | libretexts |
| Bipartite Interference and Air Pollution Transport: Estimating Health Effects of Power Plant Interventions Corwin Zigler, Vera Liu, Fabrizia Mealli | L4–5 Advanced | CC-BY | mirrored | 43 pp. | arxiv |
| Birational Calabi--Yau n-folds have equal Betti numbers Victor V. Batyrev | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Bitcoin Does Not Hedge Inflation Mykola Pinchuk | L4–5 Advanced | CC-BY | mirrored | 22 pp. | arxiv |
| Bivariate binomial conditionals distributions with positive and negative correlations: A statistical study Indranil Ghosh, Filipe Marques, Subrata Chakraborty | L4–5 Advanced | CC-BY | mirrored | 19 pp. | arxiv |
| Black-box Coreset Variational Inference Dionysis Manousakas, Hippolyt Ritter, Theofanis Karaletsos | L4–5 Advanced | CC-BY | mirrored | 26 pp. | arxiv |
| Black-Scholes-Like Derivative Pricing With Tsallis Non-extensive Statistics Fredrick Michael, M.D. Johnson | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Block diagonalization of block circulant quaternion matrices and the fast calculation for T-product of quaternion tensors Meng-Meng Zheng, Guyan Ni | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |
| Blowup dynamics for equivariant critical Landau--Lifshitz flow Fangyu Han, Zhong Tan | L4–5 Advanced | CC-BY | mirrored | 50 pp. | arxiv |
| Blow-up for semilinear wave equations on Kerr black hole backgrounds Mengyun Liu, Chengbo Wang | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |
| Blow-up of a structural acoustics model Baowei Feng, Yanqiu Guo, Mohammad A. Rammaha | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |
| Blowup polynomials and delta-matroids of graphs Projesh Nath Choudhury, Apoorva Khare | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |
| Blueprint Reading and Technical Sketching Richard Gentry | L1–3 Foundational | CC-BY | mirrored | 121 pp. | libretexts |
| Bohemian Needlework and Costumes | L2–5 Introductory | Public domain | mirrored | 4 pp. | wikisource |
| Boltzmann's Approach to Statistical Mechanics Sheldon Goldstein | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Boolean Satisfiability with Transitivity Constraints Randal E. Bryant, Miroslav N. Velev | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Boosting Applied to Word Sense Disambiguation Gerard Escudero, Lluis Marquez, German Rigau | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Boosting the Differences: A fast Bayesian classifier neural network Ninan Sajeeth Philip, K. Babu Joseph | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Bootstrapping a Tagged Corpus through Combination of Existing Heterogeneous Taggers Jakub Zavrel, Walter Daelemans | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Botchan | L2–5 Introductory | Public domain | mirrored | 280 pp. | wikisource |
| Both eyes open: Vigilant Incentives help Regulatory Markets improve AI Safety Paolo Bova, Alessandro Di Stefano, The Anh Han | L4–5 Advanced | CC-BY | mirrored | 42 pp. | arxiv |
| Bouchaud's model exhibits two different aging regimes in dimension one Gerard Ben Arous, Jiri Cerny | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Boundary Regularity for an Even Order Elliptic System in the Critical Dimension Ming-Lun Liu, Yao-Lan Tian | L4–5 Advanced | CC-BY | mirrored | 6 pp. | arxiv |
| Bounded rationality for relaxing best response and mutual consistency: The Quantal Hierarchy model of decision-making Benjamin Patrick Evans, Mikhail Prokopenko | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |
| Bounded strategic reasoning explains crisis emergence in multi-agent market games Benjamin Patrick Evans, Mikhail Prokopenko | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |
| Bounding Kolmogorov distances through Wasserstein and related integral probability metrics Robert E. Gaunt, Siqi Li | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |
| Bounds on one-dimensional exchange energies with application to lowest Landau band quantum mechanics Christian Hainzl, Robert Seiringer | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Bradley-Terry Modeling with Multiple Game Outcomes with Applications to College Hockey John T. Whelan, Jacob E. Klein | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |
| Brainstorm/J: a Java Framework for Intelligent Agents Alejandro Zunino, Analia Amandi | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Bridging the gap between pricing and reserving with an occurrence and development model for non-life insurance claims Jonas Crevecoeur, Katrien Antonio, Stijn Desmedt | L4–5 Advanced | CC-BY | mirrored | 32 pp. | arxiv |
| Bridging the Gap Between Vision Transformers and Convolutional Neural Networks on Small Datasets Zhiying Lu, Hongtao Xie, Chuanbin Liu | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |
| British Literature Through History LibreTexts | L1–3 Foundational | CC-BY-NC-SA-3.0 | link only | — | libretexts |
| Broken Replica Symmetry Bounds in the Mean Field Spin Glass Model Francesco Guerra (University of Rome 'La Sapienza', INFN, Rome) | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| BSA -- Bi-Stiffness Actuation for optimally exploiting intrinsic compliance and inertial coupling effects in elastic joint robots Dennis Ossadnik, Mehmet C. Yildirim, Fan Wu | L4–5 Advanced | arxiv-nonexclusive | link only | — | arxiv |
| Bubble, Critical Zone and the Crash of Royal Ahold G. Broekstra (Nyenrode Univ.), D. Sornette (CNRS-Univ. Nice, UCLA) | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Budget of Paradoxes | L2–5 Introductory | Public domain | mirrored | 775 pp. | wikisource |
| Building Accurate Semantic Taxonomies from Monolingual MRDs German Rigau & Horacio Rodriguez (Departament de LSI, Universitat Politecnica de Catalunya) & Eneko Agirre (Lengoia eta Informatikoak saila, Euskal Erriko Universitatea) | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Building a Medical Terminology Foundation (Carter and Rutherford) | L1–3 Foundational | CC-BY | mirrored | 279 pp. | libretexts |
| Building Information - Representation and Management Principles and Foundations for the Digital Era Alexander Koutamanis | L1–3 Foundational | CC-BY-NC-SA | mirrored | 142 pp. | libretexts |
| Building Maintenance & Construction - Tools and Maintenance Tasks Clifford Rutherford | L1–3 Foundational | CC-BY | mirrored | 173 pp. | libretexts |
| Bunsetsu Identification Using Category-Exclusive Rules Masaki Murata, Kiyotaka Uchimoto, Qing Ma | L4–5 Advanced | Licence unknown | link only | — | arxiv |
| Business Computers 365 Marcus Lacher | L1–3 Foundational | CC-BY-NC-SA | mirrored | 172 pp. | libretexts |
| Business English for Success | L1–3 Foundational | CC-BY-NC-SA-3.0 | mirrored | 439 pp. | libretexts |
| Business Ethics | L1–2 Foundational | CC-BY-NC-SA | mirrored | 355 pp. | openstax |
| Business Ethics OpenStax | L1–3 Foundational | CC-BY | mirrored | 300 pp. | libretexts |
| Business Information Systems - Design an App for That Anonymous | L1–3 Foundational | Licence unknown | link only | 199 pp. | libretexts |