Nothing says "curated list of useful resources" like copying other people's lecture notes to your own site / Google Docs. For instance, on this list:

https://profhugodegaris.wordpress.com/classical-mechanics-2/

here's a breakdown of the "papers":

* anon, A Brief Introduction to Classical, Statistical, and Quantum Mechanics (free)

Not "anon". Ends with the back cover of the book of the same name by Oliver Buehler.

* anon, Classical Mechanics I, Review Problems (free)

Not "anon", as presumably SOMEBODY taught Physics 503a at Emory in 1996 / 1997.

* anon, Resonances in Classical Mechanics (free)

More lecture notes. Who knows where "221B" was taught.

* Deotto et al, Hilbert Space Structure in Classical Mechanics, II (free)

PDF of an article from the Journal of Mathematical Physics. Not free, see AIP's site for terms

* Doran, Grassmann Mechanics, Multivector Derivatives and Geometric Algebra (free)

Preprint (?) of an article in conference proceedings. Springer may disagree with "free" on this.

* Duviryak, Classical Mechanics of Relativistic Particle with Colour (free)

Quite far off-topic for a traditional Classical Mechanics course; assumes sizable math (fiber bundles) and physics (Yang-Mills fields) knowledge.

* Fitzpatrick, Classical Mechanics, An Introductory Course (free)

Another batch of somebody else's lecture notes, from 2006.

* Forger, Romer, Currents and the Energy-Momentum Tensor in Classical Field Theory, A Fresh Look at an Old Problem (free)

This is hep-th/0307199 from arXiv.

* Hestenes, Hamiltonian Mechanics with Geometric Calculus (free)

From the same proceedings as the Doran article above.

* Hestenes, Spinor Particle Mechanics (free)

Another conference proceeding.

* Lasenby et al, Grassmann Calculus, Pseudoclassical Mechanics and Geometric Algebra (free)

Another Lasenby / Doran / Gull paper. This one's from J. Math. Phys.

* Morin, Introductory Classical Mechanics, with Problems and Solutions (free)

This has the copyright notices IN THE PDF, ffs. May be a 2003 draft of Morin's 2008 book.

* Nelson, Derivation of Schrodinger Equation from Newtonian Mechanics (free)

From Physical Review, 1966.

* Olshanetsky, Perelomov, Classical Integrable Finite-Dimensional Systems Related to Lie Algebras (free)

From Physics Reports. In a new low, has ORDERING INFO on the first page of the PDF. Yep, totes free...

* Pascazio, The Action in Classical Mechanics (free)

The first one on this list whose source wasn't immediately trackable. Reads like a lecture handout.

* Pearson, An Exact Classical Mechanics Leads toward Quantum Gravitation (free)

Self-published "here's my scheme to replace relativity" crankery. This doesn't belong here.

* Rajeev, PHY 411, Advanced Classical Mechanics (Chaos) (free)

More lecture notes, this time from U. of Rochester, 2002.

* Rosu, Classical Mechanics (free)

This is physics/9909035 from arXiv.

* Routh, A Treatise on the Dynamics of a Particle (free)

Out-of-copyright, as this is from 1898.

* Seahra, The Classical and Quantum Mechanics of Systems with Constraints (free)

Notes on a course, from a student. http://www.math.unb.ca/~seahra/notes.html

* Tabachnikov, Math Methods of Classical Mechanics (free)

More lecture notes, with a bonus giant photo of the original author.

* Tabunshchyk, Hamilton-Jakobi Method for Classical Mechanics in Grassmann Algebra (free)

This is math-ph/9911001 from arXiv.

* Tatum, Classical Mechanics (free)

Lecture notes from the University of Victoria

* Woit, Hamiltonian Mechanics and Symplectic Geometry (free)

Lecture notes from Mathematics G6434 at Columbia.

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Most of what's here isn't "free"; arXiv articles and out-of-copyright papers from 1898 are the exceptions not the rule.