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+
+OpenBSD_malloc_Linux.c:
+
+    The OpenBSD malloc implementation, ported to Linux.  Used only when
+    --enable-openbsd-malloc is passed to the configure script.
+
+strlcat.c
+strlcpy.c
+
+    Implementations of strlcat and strlcpy, the more sane replacements
+    for strcat and strcpy.  These are nonstandard, and some libc
+    implementations refuse to add them for religious reasons.
+
+eventdns.[ch]
+
+    A fork of Libevent's DNS implementation, used by Tor when Libevent
+    2.0 or later is not available.  Once Libevent 2.0 is required, we
+    should throw this away; it has diverged from evdns.[ch], and is
+    no longer easily mergeable.
+
+ht.h
+
+    An implementation of a hash table in the style of Niels Provos's
+    tree.h.  Shared with Libevent.
+
+tinytest.[ch]
+tinytest_demos.c
+tinytest_macros.h
+
+    A unit testing framework. https://github.com/nmathewson/tinytest
+
+tor_queue.h
+
+    A copy of sys/queue.h from OpenBSD.  We keep our own copy rather
+    than using sys/queue.h, since some platforms don't have a
+    sys/queue.h, and the ones that do have diverged in incompatible
+    ways.  (CIRCLEQ or no CIRCLEQ? SIMPLQ or STAILQ?)  We also rename
+    the identifiers with a TOR_ prefix to avoid conflicts with
+    the system headers.
+
+curve25519_donna/*.c
+
+    A copy of Adam Langley's curve25519-donna mostly-portable
+    implementations of curve25519.