diff --git a/.github/FUNDING.yml b/.github/FUNDING.yml
index e0c2bec9e..35448d4dc 100644
--- a/.github/FUNDING.yml
+++ b/.github/FUNDING.yml
@@ -1,2 +1,2 @@
patreon: assimp
-custom: https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=4JRJVPXC4QJM4
+open_collective: assimp
diff --git a/Readme.md b/Readme.md
index c6212bcc0..6198d403e 100644
--- a/Readme.md
+++ b/Readme.md
@@ -105,12 +105,6 @@ Become a financial contributor and help us sustain our community. [[Contribute](
Monthly donations via Patreon:
[](http://www.patreon.com/assimp)
-
-
-One-off donations via PayPal:
-
[](https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=4JRJVPXC4QJM4)
-
-
#### Organizations
diff --git a/appveyor.yml b/appveyor.yml
deleted file mode 100644
index 4fb79dd69..000000000
--- a/appveyor.yml
+++ /dev/null
@@ -1,81 +0,0 @@
-# AppVeyor file
-# http://www.appveyor.com/docs/appveyor-yml
-
-# clone directory
-clone_folder: c:\projects\assimp
-
-clone_depth: 1
-
-# branches to build
-branches:
- # whitelist
- only:
- - master
-
-matrix:
- fast_finish: true
-
-image:
- - Visual Studio 2013
- #- Visual Studio 2015
- #- Visual Studio 2017
- - Visual Studio 2019
- #- MinGW
-
-platform:
- - Win32
- - x64
-
-configuration: Release
-
-install:
- - set PATH=C:\Ruby24-x64\bin;%PATH%
- - set CMAKE_DEFINES -DASSIMP_WERROR=ON
- - if [%COMPILER%]==[MinGW] set PATH=C:\MinGW\bin;%PATH%
- - if "%APPVEYOR_BUILD_WORKER_IMAGE%"=="Visual Studio 2013" set CMAKE_GENERATOR_NAME=Visual Studio 12 2013
- - if "%APPVEYOR_BUILD_WORKER_IMAGE%"=="Visual Studio 2015" set CMAKE_GENERATOR_NAME=Visual Studio 14 2015
- - if "%APPVEYOR_BUILD_WORKER_IMAGE%"=="Visual Studio 2017" set CMAKE_GENERATOR_NAME=Visual Studio 15 2017
- - if "%APPVEYOR_BUILD_WORKER_IMAGE%"=="Visual Studio 2019" set CMAKE_GENERATOR_NAME=Visual Studio 16 2019
- - cmake %CMAKE_DEFINES% -G "%CMAKE_GENERATOR_NAME%" -A %platform% .
- # Rename sh.exe as sh.exe in PATH interferes with MinGW - if "%APPVEYOR_BUILD_WORKER_IMAGE%"=="Visual Studio 2015" set CMAKE_GENERATOR_NAME=Visual Studio 14 2015
-
- - rename "C:\Program Files\Git\usr\bin\sh.exe" "sh2.exe"
- - set PATH=%PATH%;"C:\\Program Files (x86)\\Inno Setup 5"
- - ps: Invoke-WebRequest -Uri https://download.microsoft.com/download/5/7/b/57b2947c-7221-4f33-b35e-2fc78cb10df4/vc_redist.x64.exe -OutFile .\packaging\windows-innosetup\vc_redist.x64.exe
- - ps: Invoke-WebRequest -Uri https://download.microsoft.com/download/1/d/8/1d8137db-b5bb-4925-8c5d-927424a2e4de/vc_redist.x86.exe -OutFile .\packaging\windows-innosetup\vc_redist.x86.exe
-
-cache:
- - code\assimp.dir\%CONFIGURATION%
- - contrib\zlib\zlibstatic.dir\%CONFIGURATION%
- - contrib\zlib\zlib.dir\%CONFIGURATION%
- - tools\assimp_cmd\assimp_cmd.dir\%CONFIGURATION%
- - tools\assimp_view\assimp_viewer.dir\%CONFIGURATION%
- - test\unit.dir\%CONFIGURATION%
- - bin\.mtime_cache
-
-before_build:
- - echo NUMBER_OF_PROCESSORS=%NUMBER_OF_PROCESSORS%
- - ruby scripts\AppVeyor\mtime_cache -g scripts\AppVeyor\cacheglobs.txt -c bin\.mtime_cache\cache.json
-
-build_script:
- cmake --build . --config Release -- /maxcpucount:2
-
-after_build:
- - if "%APPVEYOR_BUILD_WORKER_IMAGE%"=="Visual Studio 2017" (
- if "%platform%"=="x64" (
- iscc packaging\windows-innosetup\script_x64.iss
- ) else (
- iscc packaging\windows-innosetup\script_x86.iss
- )
- )
- - 7z a assimp.7z bin\%CONFIGURATION%\* lib\%CONFIGURATION%\*
-
-test_script:
- - cmd: bin\%CONFIGURATION%\unit.exe --gtest_output=xml:testout.xml
-
-on_finish:
- - ps: (new-object net.webclient).UploadFile("https://ci.appveyor.com/api/testresults/junit/$($env:APPVEYOR_JOB_ID)", (Resolve-Path .\testout.xml))
-
-artifacts:
- - path: assimp.7z
- name: assimp_lib
diff --git a/scripts/AppVeyor/cacheglobs.txt b/scripts/AppVeyor/cacheglobs.txt
deleted file mode 100644
index 0f5f04a4a..000000000
--- a/scripts/AppVeyor/cacheglobs.txt
+++ /dev/null
@@ -1,4 +0,0 @@
-code/*.{%{cpp}}
-contrib/**/*.{%{cpp}}
-include/**/*.{%{cpp}}
-test/**/*.{%{cpp}}
diff --git a/scripts/AppVeyor/mtime_cache b/scripts/AppVeyor/mtime_cache
deleted file mode 100644
index e296e3658..000000000
--- a/scripts/AppVeyor/mtime_cache
+++ /dev/null
@@ -1,177 +0,0 @@
-#!/usr/bin/env ruby
-
-#
-# mtime_cache
-# Copyright (c) 2016 Borislav Stanimirov
-#
-# Permission is hereby granted, free of charge, to any person obtaining a copy
-# of this software and associated documentation files (the "Software"), to
-# deal in the Software without restriction, including without limitation the
-# rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
-# sell copies of the Software, and to permit persons to whom the Software is
-# furnished to do so, subject to the following conditions:
-#
-# The above copyright notice and this permission notice shall be included in
-# all copies or substantial portions of the Software.
-#
-# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
-# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
-# IN THE SOFTWARE.
-#
-
-require 'digest/md5'
-require 'json'
-require 'fileutils'
-
-VERSION = "1.0.2"
-
-VERSION_TEXT = "mtime_cache v#{VERSION}"
-
-USAGE = <] [-g globfile] [-d] [-q|V] [-c cache]
-ENDUSAGE
-
-HELP = < '.mtime_cache.json', :globs => [] }
-
-ARGV.each do |arg|
- case arg
- when '-g', '--globfile' then param_arg = :globfile
- when '-h', '-?', '--help' then ARGS[:help] = true
- when '-v', '--version' then ARGS[:ver] = true
- when '-q', '--quiet' then ARGS[:quiet] = true
- when '-V', '--verbose' then ARGS[:verbose] = true
- when '-d', '--dryrun' then ARGS[:dry] = true
- when '-c', '--cache' then param_arg = :cache
- else
- if param_arg
- ARGS[param_arg] = arg
- param_arg = nil
- else
- ARGS[:globs] << arg
- end
- end
-end
-
-def log(text, level = 0)
- return if ARGS[:quiet]
- return if level > 0 && !ARGS[:verbose]
- puts text
-end
-
-if ARGS[:ver] || ARGS[:help]
- log VERSION_TEXT
- exit if ARGS[:ver]
- log USAGE
- log HELP
- exit
-end
-
-if ARGS[:globs].empty? && !ARGS[:globfile]
- log 'Error: Missing globs'
- log USAGE
- exit 1
-end
-
-EXTENSION_PATTERNS = {
- :cpp => "c,cc,cpp,cxx,h,hpp,hxx,inl,ipp,inc,ixx"
-}
-
-cache_file = ARGS[:cache]
-
-cache = {}
-
-if File.file?(cache_file)
- log "Found #{cache_file}"
- cache = JSON.parse(File.read(cache_file))
- log "Read #{cache.length} entries"
-else
- log "#{cache_file} not found. A new one will be created"
-end
-
-globs = ARGS[:globs].map { |g| g % EXTENSION_PATTERNS }
-
-globfile = ARGS[:globfile]
-if globfile
- File.open(globfile, 'r').each_line do |line|
- line.strip!
- next if line.empty?
- globs << line % EXTENSION_PATTERNS
- end
-end
-
-if globs.empty?
- log 'Error: No globs in globfile'
- log USAGE
- exit 1
-end
-
-files = {}
-num_changed = 0
-
-globs.each do |glob|
- Dir[glob].each do |file|
- next if !File.file?(file)
-
- mtime = File.mtime(file).to_i
- hash = Digest::MD5.hexdigest(File.read(file))
-
- cached = cache[file]
-
- if cached && cached['hash'] == hash && cached['mtime'] < mtime
- mtime = cached['mtime']
-
- log "mtime_cache: changing mtime of #{file} to #{mtime}", 1
-
- File.utime(File.atime(file), Time.at(mtime), file) if !ARGS[:dry]
- num_changed += 1
- else
- log "mtime_cache: NOT changing mtime of #{file}", 1
- end
-
- files[file] = { 'mtime' => mtime, 'hash' => hash }
- end
-end
-
-log "Changed mtime of #{num_changed} of #{files.length} files"
-log "Writing #{cache_file}"
-
-if !ARGS[:dry]
- dirname = File.dirname(cache_file)
- unless File.directory?(dirname)
- FileUtils.mkdir_p(dirname)
- end
- File.open(cache_file, 'w').write(JSON.pretty_generate(files))
-end