Lucid
- Functional dataflow language, invented by Bill Wadge, Ed Ashcroft. Variables and expressions denote streams-sequences of data items. Input and output are streams, so a program is a Unix-style filter. Was basis for French real-time/reactive languages Lustr
- http://i.csc.uvic.ca/home/hei/hei.ise

Scala
- General purpose language; multiparadigm (object-oriented, functional, concurrent elements); statically typed, type-safe; focus: Web services. Successor of Funnel. Interoperates with Java VM or .NET, XML aware. [Open source, BSD-like license]
- http://www.scala-lang.org/

XLR: Extensible Language and Runtime
- XL is designed to implement the ideas of Concept Programming. It can apply to many domains and problem spaces, not only a small subset of the problems users must solve.
- http://xlr.sourceforge.net/

UFO: United Functions and Objects: Draft Language Description
- Download of UMCS-92-4-3.
- http://www.cs.manchester.ac.uk/Intranet_subweb/library/cstechrep/Abstracts/UMCS-92-4-3.html

Muliparadigm Programming Language
- By Anthony A. Aaby; 1998. Exercise to design an abstract grammar for elements that programming languages share, more so for abstraction, generalization, and modules; to integrate the grammar with abstract grammars for many paradigms.
- http://cs.wwc.edu/~aabyan/PLBook/HTML/Unified/

Needle
- Pure object-oriented, functional language, statically typed, garbage collected; mixes ideas from Dylan, Lisp, Scheme; ML; Cecil, Smalltalk; description, slide show, downloads, links. [Open Source, MIT]
- http://www.nongnu.org/needle/

Multiparadigm Programming Language
- Brief description, language list sorted by count and supported paradigms. [Wikipedia]
- http://en.wikipedia.org/wiki/Multi-paradigm_programming_language

Nial Systems Ltd.
- NIAL, Nested Interactive Array Language, mixes aspects of functional array and procedural languages. Rich primitives set makes it easy, fast to code loop-free data-driven algorithms. Also Q'Nial IDE, and Nial Data Engine embeddable interpreter. [Open Sour
- http://www.nial.com/

Lfyre
- General purpose, compiled; high performance, expressiveness, flexibility. Many features found in other languages, and extra features: creating new operators, keywords, programming paradigms. News, download. [SourceForge]
- http://sourceforge.net/projects/lfyre/

Heron: Introducing The Heron Programming Language
- Forum with many comments. [Slashdot]
- http://developers.slashdot.org/article.pl?sid=04/12/08/1944233

Heron-Centric: Ruminations of a Language Designer
- Weblog on language design issues, software development techniques, news, on Heron language, and similar languages like Java, C++.
- http://www.artima.com/weblogs/index.jsp?blogger=cdiggins

Heron
- Home site. Has brief description, specification, tutorial, related articles, download.
- http://www.heron-language.com/

ResearchIndex: From Competition to Amalgamation of Different Programming Paradigms
- Describes basic elements (data, actions, tunings, voids, mixtures, ...) and principles of programming (stratification, implicit knowledge, limited freedom, ...), directed to amalgamating different programming paradigms (imperative, object-oriented, functi
- http://citeseer.ist.psu.edu/386474.html

Piccola Wiki
- Wiki for this language. Treats 2 implementations: JPiccola, done in Java; SPiccola, done in Squeak. Descriptions, tutorial, syntax, libraries, bug list, FAQ.
- http://scgwiki.iam.unibe.ch:8080/SCG/10

ELAN
- Created 1974 by Technical University of Berlin group, as alternative to BASIC in teaching, for systematic programming, and related styles: top-down, bottom-up, recursive, modular, syntax-directed. Descriptions, brief resource list, documents. English, Deu
- http://os.inf.tu-dresden.de/L4/l3elan.html

Multiparadigm Programming Group
- At Leibniz Laboratory, Grenoble, France; research topics, news, publications, members. In English and Français.
- http://www-leibniz.imag.fr/PMP/

X Language: xlang
- The eXtensible Language: easy to use, multi-syntax, portable set of APIs to create CLI and GUI applications for Unix/X11 and Win32; will ease making big applications, has interpreter/compiler/debugger. [Open Source, GPL]
- http://www.nongnu.org/xlang/

An Object Model for Multiparadigm Programming
- Presented at OOPSLA 1994.
- http://www.spinellis.gr/pubs/conf/1994-OOPSLA-Multipar/html/mlom.html

Lightweight Languages as Software Engineering Tools
- Usenix Paper discussing multiparadigm programming as part of a larger topic.
- http://www.usenix.org/publications/library/proceedings/dsl97/full_papers/spinellis/spinellis_html/spinellis.html

Piccola: A Small Composition Language
- PI based COmposition LAnguage: research language to explore the paradigm: Application = Components + Scripts. From the University of Berne.
- http://www.iam.unibe.ch/~scg/Research/Piccola/

Concepts and Architecture of Vista: A Multiparadigm Programming Environment
- Visual multiparadigm programming: visual + object-oriented (signal flow + data flow); from Proceedings of 10th IEEE/CS Symposium on Visual Languages, St. Louis, USA, 4-7 October 1994. Downloads: HTML, PS.
- http://www.swe.uni-linz.ac.at/publications/abstract/TR-SE-94.17.html

Multiparadigm Parallel Programming Environments
- Text and diagrams on two main parallel programming paradigms (data parallel, explicit message passing), and sequential multiparadigm programming with corresponding parallel versions.
- http://www.npac.syr.edu/users/gcheng/homepage/thesis/node15.html

Object Oriented and Procedural Lisp
- Brief, well written description of Lisp as a framework language, and related benefits.
- http://www.alu.org/table/objects.htm

Kx Systems, Inc.
- Makes K, advanced vector oriented, functional language, one of the fastest application development environments (according to Bell Laboratories Benchmarking), and allows very fast processing of large datasets.
- http://www.kx.com/