Posted:November 18, 2007

Sweet Tools Listing

Version 11 Shows Semantic Web Tools Announcements to be on a Furious Pace

This AI3 blog maintains Sweet Tools, the largest listing of about 800 semantic Web and -related tools available. Most are open source. Click here to see the current listing!

After a two months hiatus, I have just updated AI3's listing of semantic Web and -related tools to version 11; follow the links below.

This version adds 72 new tools — one of the largest additions ever — since the last update on September 16, bringing the new total to 650 tools.

Like prior versions, this new Sweet Tools listing is provided either as:

Background on prior listings and earlier statistics may be found on these previous posts:

With interim updates periodically over that period.

In thanks to Henry Story, whose chat note prompted me to post this long overdue update, I have also included some of the tools breakdowns he enjoys.

Some Stats

Here is a table of tools categories, showing both the last breakdown from about 9 months ago when there were 500 tools in the listing, and today with 650 tools:

3/11/2007 11/18/2007 Category
11 24 Ontology Mapper/Mediator
3 6 RDF Editor
2 4 RDF Generator
13 23 Query Language or Service
19 32 Search Engine
23 37 Browser (RDF, other)
20 30 RDF (general)
23 33 NLP/Language Processor
15 21 Visualization
29 40 Composite App/Framework
9 12 Ontology Editor
22 28 Wiki- or blog-related
32 39 Ontology (general)
5 6 Semantic Desktop
22 26 Reasoner/Inference Engine
26 30 Annotator
29 33 Database/Datastore
8 9 Data Language
48 53 Miscellaneous
30 33 Parser or Converter
43 45 Information Extraction
22 23 Wrapper (Web data extractor)
3 3 Description or Formal Logics
4 4 Harvester
25 25 Programming Environment
8 8 Validator
3 Chat-related
3 Data Presentation
3 Mashup/Meshup Framework
2 Rules and related
6 12 NOT ACTIVE (???)
500 650

The fastest growing categories are listed first, with RDF, ontologies, and search growing the most. Note some categories have been added and others are being re-classified or delisted as time and familiarity with the listing grows. Certain areas of current interest, such as NLP, also see increased listings as a result. Of course, all such categorizations have a degree of arbitrariness.

As with the last survey, Java and JavaScript are dominant languages, with considerable growth. Python and PHP have also shown higher than average growth. Ruby appears to have stagnated, and many other languages are in second-tier positions:

Sweet Tools by Language

You’ll be pleased to see, Henry, that Java is still holding serve on market share!

Note: Because of comments expirations on prior posts, this entry is now the new location for adding a suggested new tool. Simply provide your information in the comments section, and your tool will be included in the next update. (Hopefully, that will not take another two months!) :)

Posted:November 15, 2007

(or, Cold Fusion Revisited?)

I do not have the physics or math background, but simplicity and elegance (expressed as symmetry) have always appealed to me. In an online paper titled, “An Exceptionally Simple Theory of Everything,” ( arXiv:0711.0770v1 [hep-th], Nov. 6, 2008, 31 pp, PDF), A. Garrett Lisi writes:

"The theory proposed in this paper represents a comprehensive unification program, describing all fields of the standard model and gravity as parts of a uniquely beautiful mathematical structure. The principal bundle connection and its curvature describe how the E8 manifold twists and turns over spacetime, reproducing all known fields and dynamics through pure geometry. Some aspects of this theory are not yet completely understood, and until they are it should be treated with appropriate skepticism. However, the current match to the standard model and gravity is very good. Future work will either strengthen the correlation to known physics and produce successful predictions for the LHC [Large Hadron Collider], or the theory will encounter a fatal contradiction with nature. The lack of extraneous structures and free parameters ensures testable predictions, so it will either succeed or fail spectacularly. If E8 theory is fully successful as a theory of everything, our universe is an exceptionally beautiful shape."
E8 Shape

Lisi’s inspiration lies in an elegant and intricate mathetmatical shape called E8 — a complex structure with a rank of 8 (the maximum number of mutually commutative degrees of freedom) and 248 dimensions. It was first described in 1887, but was only fully explicated by mathematicians (with NPR audio) this year.

Lisi believes the algebra underlying this shape holds the key to the so-called Theory of Everything, the elusive equation to unite Einstein’s General Relativity with quantum mechanics. Relativity explains how the universe works on very large scales; quantum mechanics describes the world of tiny elementary particles.

BTW, there are some other beautiful shapes in this paper, lucid text and head-scratching equations! Here is also a reference to Lisi’s beautiful visualization that shows projections of various rotations of this E8 root system in eight dimensions:

BTW BTW, if you really want to dig further into Lisi’s approach to the Theory of Everything, a good posting with background and context is available from Sabine Hossenfelder.

Posted by AI3's author, Mike Bergman Posted on November 15, 2007 at 2:54 pm in Adaptive Information | Comments (2)
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