Resources for Undergraduates

Note: These are incomplete lists, I'm happy to hear any suggestions for additions.

Research Opportunities for Undergraduate Students

Research Experiences for Undergraduates (REUs) are summer research opportunities. They are competitive to get into but really great experiences for learning what research is like. Due to funding limitations, these opportunities are usually limited to US citizens. Be sure to read the program information carefully to check eligibility.
QSIDE's Datathon4Justice is a yearly event where for a weekend you work with a team of researchers on quantitative approaches to social justice issues. This is a short event but can give you insights into how collaborative, interdisciplinary research works.

Joint Mathematics Meeting (JMM) and MathFest are two large, annual conferences in mathematics that have opportunities for undergraduates to present their work.
Women in Math in New England conference is a small one-day conference held annually at Smith college. I attended this as an undergraduate!
Nebraska Conference for Undergraduate Women in Mathematics is an annual conference for women in mathematics held at University of Nebraska, Lincoln.
Grace Hopper Celebration of Women in Computing is an annual conference for women and nonbinary computational scientists.
Blackwell–Tapia Conference aims to showcase the work of mathematicians from underrepresented groups and build a diverse mathematical community.

Chad Topaz's page on Getting Started with Topological Data Analysis. Included here are a list of papers that are good for newcomers to the field as well as exercises to learn some of the topology basics.
Applied Algebraic Topology Research Network (AATRN). You can subscribe to get emails about upcoming seminars. The AATRN youtube channel has hundreds of recorded talks on topics in various areas of applied topology.
Women in Computational Topology (WinCompTop). Hosts events and has a mailing list where lots of opportunities are advertised.
GEOTOP-A. You can subscribe to get emails about upcoming seminars. There are also recordings of previous talks.
DONUT. A repository of papers from applied topology.